Attracting Bluebirds: Dealing with Predators and Problems

Last week we invited you to ask questions you may have about Bluebirds, or any backyard bird subject. Trish Bolian asked us to show the difference in a Bluebird nest and a House Sparrow nest. And because Chickadees often use nest boxes we will show the 3 nest comparison. Thanks, Ms. Bolian.

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Unfortunately for nesting birds here in mid-TN there are a number of predators and pests that can deter, disrupt, or destroy an attempt to nest. It’s no different for Bluebirds.

The most common problems are the House Sparrow, Raccoons, and Rat snakes.

The House Sparrow is perhaps the most common and frustrating to deal with. This introduced tenacious species is particularly noticeable in spring when the nesting season kicks in to high gear. You see them busily building nests in some of the most unlikely places, car washes, in traffic lights, gaps in broken store signs, Home Depot rafters, and in gaps or openings in just about any fast food restaurant. They may suddenly appear in yards and show interest in a nest box. Their nest is course, sloppy, and may contain debris like candy wrappers, cigarette butts, feathers, and odds and ends. These birds are highly motivated and typically get started in early March. House Sparrows have been known to pierce bluebird eggs and/or physically remove them from the nest. And in many cases they will fight the adult Bluebirds, sometimes putting so much pressure on them they decide to abandon. We have seen examples of adult Bluebirds being killed by these violent confrontations. So, what can be done? There are both passive and aggressive techniques that can be employed. The one you choose may depend on your level of past experience with House Sparrows. And we encourage you to under no circumstances allow a House Sparrow to use any of your nest boxes.

Ø If House Sparrows (HSP) begin showing interest in your Bluebird (BB) box by landing on and entering act quickly and plug the entrance hole to deny further access. Given a few days or a week of denied access the House Sparrows may become extremely eager to nest and look elsewhere. Repeat the process if they show up again. We see little evidence of BB nesting in early March but more likely early to mid-April. Be patient. Even if the BB shows up and looks at the box resist the temptation to unplug it, especially if the Sparrows have recently been there. After a few days of not seeing the HSP unplug the box and monitor for possible return. Be more patient than them and you just may win the battle.

Ø You may also pull out HSP nests and destroy eggs. Again, if this does not fit your philosophy at least plug up the box. Just don’t let them have it.

Ø We have two different Sparrow traps that can be effective. The Van Ert Sparrow trap is one that mounts inside the box and has a spring loaded mechanism that releases a door quickly closing the entrance hole thus trapping the bird inside. Pros and cons: this is a trap you should be monitoring frequently. It is best used if Bluebirds have not been present, only Sparrows. It is perfect for catching a Sparrow that has already begun nest building. After installing the trap use the Sparrows nest material taken from the box and drop it on the ground below the box. Sparrows will almost certainly go to that nest material and attempt to put it back in the box. Perfect. They go in trip the mechanism and will be caught as indicated by the bright orange marker displayed in the entrance hole. Just releasing them will put you back to square one. Relocating probably requires up to 10 miles. Relocating is not recommended and technically violates laws on transporting wildlife. The other option is to dispose of the bird. This is a touchy subject and one to be considered and decided by the individual. House Sparrows have been heavily factored into the beginning of the decline of Bluebirds many years ago. They are an introduced, non-native species therefore unprotected by law.

Ø Contraptions like the Magic Halo works quite well although we’ve seen HSP’s totally disregard it at times. The only place I’ve seen the Magic Halo available is on Amazon. The problem with the Halo is it is difficult to adapt to a bluebird box. For some reason it was made more with intent to keep Sparrows off bird feeders. The basic idea of the Halo is to create a vertical column of monofilament (fishing line) around the box. These are relatively easy to construct and one can use materials around the house to improvise. HSP’s are visibly bothered by the contraption and are reluctant to land on the box or go to the entrance, but not Bluebirds. Another contraption you may see is called the Sparrow Spooker. I am less confident in this one because I have no practical experience with it. Anything is worth a try when it comes to discouraging HSP’s. For more information about discouraging HSP’s visit the North American Bluebird Societies (NABS) website at www.nabluebirdsociety.org and Click here to visit their page on House Sparrow control.

Above all before taking action please positively identify the bird going into your nest box. Be sure it is a House Sparrow. Any other native species should be welcomed and have a chance to use the box.

Raccoons and Rat snakes are formidable predators and can be dealt with in much the same way. Raccoons are intelligent and great climbers, and Rat snakes are supreme climbers. Not all of us presenting Bluebird boxes will encounter these two but if you experience regular and on-going visits from Raccoons at your bird feeders we would encourage you to employ a Raccoon baffle on a pole to protect your Bluebird box. We carry baffles that will fit a metal pole up to 1 ¾” diameter, and wood posts up to 3 5/8” (todays 4x4). It should be noted a squirrel baffle may or may not stop either one of these predators. YouTube is loaded with videos of raccoons negotiating around a squirrel baffle.

Box placement has proven to be a factor, too. My 10 box Bluebird trail in a field has had no predation by Raccoons in many years of service. Boxes placed more in field and meadow situations tend to see less raccoon activity. Boxes placed adjacent to woodland and stream environments tend to see more. In this situation placing a nest box on a tree is not advised. This goes for rat snakes, too. A good raccoon baffle should stop both raccoons and rat snakes the vast majority of the time. For do it yourselfers you may want to check out the National Bluebird Society website for plans on PVC baffles and other critter stopping hardware and tips. Click here for NABS Predator control page.

Cats account for the majority of damage to bird populations in general. If you have a cat that is mostly outdoors and does a lot of hunting please reconsider this practice, but also we would recommend not having birdhouses or feeders until such time that you no longer have a cat. No guard or baffle stops a cat and most of the time a cat is waiting for its prey on the ground. Bluebirds are primarily ground feeders and become an easy target.

We can’t protect Bluebirds from every possible dangerous scenario in nature but it’s been through efforts of homeowner and Bluebird organizations that Bluebird numbers are strong today. Through a thoughtful and common sense approach to placement of boxes, observation, and monitoring we can continue to help Bluebirds thrive and enjoy being a part of the process and their success. As always we are available for on sight consultations and in-store recommendations.

Attracting Warblers

Fall is a Great Time to Garden for the Birds

Fall is the best time to plant and perhaps you are thinking about adding something to your landscape that appeals to birds and wildlife. Fantastic! Adding plants is a great way to attract birds of all kinds but especially those that do not regularly visit seed feeders. I’m referring to the small tropical birds known as Warblers. This diverse and beautiful group of birds goes unnoticed by many backyard birders because their yards don’t have the habitat appeal necessary to pull them in. Each spring Warblers migrate into and through TN on the way to their breeding destination. As they travel they are searching for food, water, and suitable, safe resting areas.

Native trees and shrubs are critical to attracting birds of all kinds and especially warblers. Native plants attract native insects, an important food source to migrating birds. In spring when leaves are first opening the first caterpillars begin hatching which is an abundant and important food source for all migrating birds. In early fall native trees and shrubs are producing fruit that will help fuel their migration back to the tropics. The fruit also attracts native insects which then become an important source of protein. You can’t go wrong planting natives because they are, typically, less susceptible to disease and insect problems.

Here’s a short list of some of my favorite native plants and shrubs:

Serviceberry               Bottlebrush Buckeye            Devils Walking Stick

American Beautyberry  Redbud                                Dogwood

Hawthorn                       Persimmon                           American Holly

Winterberry                    Eastern Red Cedar               Mountain Laurel

Sumac                            Oak and Maple varieties       Viburnums

…and there are so many more great plants to choose from.

But Warblers need water, too, and from my experience water is the x factor.  It is probably that my water source is very easy to see from in my home that I have seen more Warbler species there than anywhere else in my yard.  Bubbling, moving water is much more appealing than the standard pedestal type birdbath.  Keep the water moving in some way and birds will be drawn.  There are drippers and misters that run on water pressure provided by a standard outside faucet, and waterfall rocks powered by an electric pump that are quite effective at keeping water moving.  I recently hung a plastic jug with a pin hole above a standard pedestal birdbath.  When filled with water the jug will provide a steady drip for a few hours at a time.  The dripping and subsequent rippling effect is absolutely more appealing than a still source of water.

So, if making your yard more appealing to birds is on your mind think about native plants and water.  It is a combination that most definitely works.

For more information about native plants please take a look at the TN Native Plants Society website, www.tnps.org, or check out a local grower like Growild located in Fairview, TN. Their website is www.growildinc.com

Fall Migration Notes

Fall Migration is underway and while your birdfeeders will slow down as we approach October birdwatching will only get more interesting.  Have your binoculars with you and ready because warblers are pouring through middle Tennessee stopping to feed in the early mornings on insects and berries.  Mornings are the best time to see lots of different species of warblers.  And mornings after a storm tend to be even better.  Make time to visit one of the many great local birdwatching areas this fall to see some of them.  For information about great places to birdwatch click on the links below…

• Tennessee Birding Trails is a great website for locating trails for specific types of birding.

• Tennessee Birding Facebook group has an active community of birders who post often.

• Tennessee Ornithological Society (TOS) Nashville Chapter is having their Radnor Lake Wed morning bird walks September 19th and continue each Wednesday through October 10th. Please meet in the west Parking lot outside the Visitor’s Center at 7:30am. Come rain or shine. With the exception of ongoing downpours or thunderstorms.

• TN-BIRD email list is a free list that allows you to get updates of bird sighting from other birders in the area. to receive emails simply click on “find and join” at the top right of the tn-bird page, search for list name tn-bird, and follow the instructions on signing up your email.

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One of the more interesting, easy, and fun things to see in the fall is the migration of Chimney Swifts and Common Nighthawks. In the evenings, particularly in areas where there is outdoor lighting, like high school football games and shopping malls, Common Nighthawks gather and feed on insects. Downtown areas tend to be very productive areas to see both.

The Common Nighthawk, a member of the Goatsuckers family, measures around 9 1/2 “in length. They are gray-brown with slim, long wings that have a distinctive white bar near the tips. They are most active at night but can be seen midday as well. They fly with long easy strokes but can quickly change direction and appear erratic as they catch flying insects. Male Nighthawks have a white throat and white band across a notched tail. Listen for the unusual “peent” call of the Nighthawk.

The Chimney Swift is a short swallowlike bird with long, slightly curved wings. Peterson’s field guide to Eastern Birds describes it as a “cigar with wings”. Always in motion, Swifts appear to continually fly never landing to rest and constantly “twitter”. They measure about 5 ½” in length and are uniformly grayish to brown. During migration Swifts have been known to roost together by the thousands in a single chimney. On more than a few occasions I have witnessed a “funnel” of swifts descending into the chimney of a downtown building while on my way to a Predators game. It is a fascinating sight.

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And About Hummingbirds

We may see Ruby-throated hummingbirds well into October so keep your feeders out with fresh nectar as there may be several waves of hummingbirds still coming through TN on their return to Central and South America. The belief that feeders should be taken down to cause the birds to migrate is incorrect.  They will leave when they are ready whether there is a feeder present or not.  

Fall slow down at feeders

Many of you have already noticed a slow down at your feeders.  Sometimes it can be abrupt and dramatic.  You may even notice some species become practically non-existent.  Bird feeders in September and October are typically very quiet. This is surprising to some but actually normal and understandable.  With the conclusion of the breeding season birds are now in less need of a quick, easy food source... your feeders.  While raising their young during the months of March through July birds expend tremendous amounts of energy and will take great advantage of backyard feeders.  We sell more seed and suet during those months than we do in winter. 

Now young birds are independent and the lives of adult birds are at a much more leisurely pace.  On top of that nature is producing an abundance of food at this time.  Not only are insects still plentiful but every tree, shrub, weed, and wildflower has produced seeds, nuts, and fruit.  There is literally food for birds everywhere.  It is a great example of the fact that birds do not rely on our feeders but simply take advantage of them in times of more demand for food.  So, don’t worry that you are not seeing many birds around the feeders right now.  It is totally normal. About the time we get the first frost or two, you will begin to see a return of your favorite birds to feeders.  I don’t know about you but a good frost sounds good right about now. 

And you will begin to see our winter visitors, like Junco’s, White-throated sparrows, Yellow-bellied sapsuckers, Kinglets, and hopefully, Purple Finch, Pine Siskin, and Red-breasted Nuthatch.

Keep this in mind while you are buying your seed next time.  It’s advisable to buy smaller quantities until birds begin visiting with more frequency in November.  Remember, the more seed you end up storing in a container over the next two months the more chance there is of having a bug hatch.   

And while birds take a break from your feeders take time to give your feeders a thorough cleaning.  Warm soapy water, a brush, and a little effort are well worth the effort to provide a clean, healthy feeding environment for the birds. 

The Hummingbird Wave is Coming

Soon hummingbirds will ramp up their interest in feeders and the action will be fast and furious.  August through mid-September is peak time for us to see hummingbirds at feeders.  Based on frequently asked questions at the store there's a lot of confusion surrounding Ruby-throated hummingbirds and the first few months they are here.  It is true Ruby-throated hummingbirds begin migrating through and into TN as early as mid-March.  This year the first reported sighting by a customer was March 30.  My first sighting was April 6th.  By the way, I've recorded first of spring (FOS) hummingbird sightings for over 20 years and it's always between April 3 and April 12.  And the first has always been an adult male. 

Occasionally we here a customer say "I have all kinds of different hummingbirds" when in fact they really only have one kind, the Ruby-throated hummingbird.  Only the adult male has the bright red throat while both sexes have an iridescent green back.  Adult females and juvenile's look very much alike but will vary somewhat in plumage.    

Although all Tennessee summer resident hummingbirds are here by mid-May, most people will see very little of them, and activity at feeders will be infrequent and minimal until at least early to mid-July when there is a sudden surge.

It is thought by many the reason for this sudden surge is they have just "come back" from where they've been.   Actually, it is that the summer resident hummingbirds have concluded raising one or even two broods of offspring and are ready to begin taking advantage of the free nectar in the feeders you've provided. Also, the added activity is indicative of recently fledged hummingbirds beginning to understand and visit feeders.  Then as we move into August hummingbirds that have been north of us, as far as Canada, will begin their migration south and stop at feeders along the way.  

It must be remembered hummingbirds don't travel all the way from central and south America because there are hummingbird feeders here.  They DO NOT NEED the feeders but will take advantage of them when they are ready.  Hummingbirds have been migrating here for thousands of years to breed and to take advantage of the abundance of insects, which is their primary food source.  They would come here even if hummingbird feeders did not exist.

Since hummingbirds feed on small insects there is an alternative to offering only nectar. Try placing some fruit in a mesh sack or container with holes, and hang it near your hummingbird feeder.  The fruit will draw fruit flies which the hummingbirds will readily devour.  It is quite interesting to see a hummingbird dart its specialized tongue out to snag the flies. Last year we introduced a new feeder called the Humm-Bug that is designed to hold fruit and draw fruit flies.  

Aspects high view Hummingbird feeders are some of our favorite feeders. They are easy to clean, fill, and come with a built in ant moat. The high view refers to the new perch design which is raised up compared to older models. This helps keep the feeder from obscuring the bird while perching.

View fullsize

Hummzinger high view excel holds 16oz and has 6 ports.

Hummzinger high view feeders come in three different sizes. 8oz, 12oz, and 16oz.

Humzinger high view mini holds 8oz and has three ports.

Humzinger high view holds 12oz and has four ports.

Hummingbird Nectar

A question frequently asked at The Wood Thrush Shop is “what nectar is best for hummingbirds”? 

The best nectar you can offer hummingbirds is a simple 1 part sugar to 4 parts water solution.  It is not necessary for the water to be brought to a boil before adding sugar.  The nectar is ready after the sugar has been stirred in and fully dissolved.  Do not add color. Color is absolutely unnecessary and potentially harmful. When hummingbird feeding activity is slow, like it tends to be in early spring to mid-summer, make small amounts and avoid refrigerating large quantities.  Think in terms of making fresh nectar each week in small amounts until feeding activity becomes vigorous, like it does in the latter summer months.  This is when it makes sense to make larger batches and refrigerate extra nectar.  Remember, nectar in the feeder is only good for about 3 days in summer heat.  Fill your feeder according to the activity level and you will waste less nectar and reduce your maintenance on the feeder.  The peak time for hummingbird feeding activity typically starts mid-July and lasts through September, and even into October.

So, if you’ve been disappointed and concerned because you haven’t seen much of hummingbirds now is the time to make sure your feeders are clean and the nectar is fresh.  It’s going to get very busy!

Hummingbird Myths

Hummingbirds have "scouts".  Not really sure how this got started but likely because people would see an early arrival and then other hummers would eventually follow.  There is no way an adult male Ruby-throated hummingbird would actively help or encourage others to share "his" territory.  Everyone sees how territorial they are as they fight for the rights to a feeder.  It is believed an adult male can and will defend a territory of up to an acre.

Hummingbirds and Geese.  I haven't heard this one in a long time so hopefully it has gone away for good.  It was believed by some that hummingbirds would ride on the backs of larger birds, specifically geese, during migration.  This does not occur. 

Feeders must be taken down in the fall.  We still hear this one quite often.  People believe that hummingbirds will not migrate in the fall if feeders are left out.  Not so.  It is in their DNA to migrate.  Again, hummingbirds do not NEED sugar water, so why would an artificial food source keep them here?  If we had to take away all food sources to make them migrate we would also have to eliminate all of the various insects they feed on.