A bird's labor (or: Anatomy of a Nest)

When construction of the guestudio was still in the early stages, a wonderful thing happened. As soon as the "bones" of the porch were up, a bird nest began to take shape in the rafters. I could not think of a more lovely christening of the building than that. It wasn't long before we found out that it was American Robins that chose this as their nesting area. I was quite surprised, actually, because I don't normally hear or see Robins up in our woods, at least not with much frequency.


Mama Robin, incubating eggs
Four eggs were laid in that nest, and as far as I could tell, 4 birds hatched. Unfortunately, we were gone on vacation during the time they were due to fledge, so I can only cross my fingers and hope that all 4 of them made it out successfully.


Mama Robin in a nearby Redbud tree, fluffing up a bit and asking me to kindly move away from her nest.
Fast-forward to mid-August. Construction has resumed on the guestudio after a hiatus, and the roof of the porch is finished with beadboard, closing off the space where the nest once was. Thank goodness our builders had a good enough sense about me to know that they shouldn't just toss that nest on the ground. Instead, they carefully removed it and placed it inside the building so I could have a look at it when I got home. Shortly after they relocated it I took it back outside and examined it. The architecture blew me away. For an animal with no opposable thumbs, this structure is nothing short of a miracle.


The nest, turned 180 degrees from its original orientation and settled on the porch railing so I could have a better look.
The following information about American Robin nest construction comes from the Cornell University's All About Birds website:

Females build the nest from the inside out, pressing dead grass and twigs into a cup shape using the wrist of one wing. Other materials include paper, feathers, rootlets, or moss in addition to grass and twigs. Once the cup is formed, she reinforces the nest using soft mud gathered from worm castings to make a heavy, sturdy nest. She then lines the nest with fine dry grass. The finished nest is 6-8 inches across and 3-6 inches high.

Dead grass - check

Rootlets - check

Twigs - check

Other material (part of a vining plant) - check

More "other material," strands of plastic, probably from the building construction - check

Lined with fine dry grass - check

"...soft mud gathered from worm castings to make a heavy, sturdy nest" - check

A strong, secure home in which to rear young - check. A beautiful sight to behold - you better believe it.

Bird banding at Black Swamp Bird Observatory

One of the coolest events of the Midwest Birding Symposium for me was the bird banding demos that took place at the Black Swamp Bird Observatory. The observatory, about a 40-minute drive from our Lakeside location, offered these public banding demos on Friday and Saturday morning, before the 10:00 AM keynote speaker presentations. Located only a few miles from Magee Marsh (dubbed by many as the warbler capital of North America come spring migration), the observatory is no doubt situated along the migratory path of many birds.

During the banding demo that we attended on Saturday morning we saw at least 15 different individual birds, most of whom were migratory species, and quite a few of which were life birds for me! In this post, I'm going to concentrate on the banding process itself and give you an idea of what it entails. This was my first ever banding experience, so it was interesting to observe that it's not just a matter of snapping a little band on the bird's leg.

By the way, I would just like to clarify that I did not handle any of these birds personally. All birds were banded and handled by the trained staff and volunteers of the Black Swamp Bird Observatory. This was all part of a public banding demonstration.


First you have to catch the bird. Mist nets that are 40 feet long and 8 feet high are stretched between 2 poles to catch the birds. The nets are virtually invisible to the birds, and when they fly into the net, they fall into a pocket (the several horizontal rows visible in the photo on the left give you an idea where the pockets are), where they will then be pulled out and transferred to a draw-string bag for safe-keeping until it is time to be banded.

In addition to being banded, the bird will be weighed, aged, sexed if possible, have a wing measurement taken, and fat scored (looking at the amount of fat stored in their abdomen). Here we see this hatchling year female Northern Cardinal being banded, weighed and having her wing measurement taken.

After all the measurements have been recorded, the bird will be released back into the wild. You may have heard or read that a Cardinal in the hand can be a memorable experience because they are vicious biters. The gentleman holding this bird (Mark Shieldcastle, Research Director of BSBO) noted that since this young bird didn't fully have a grasp yet on what her beak was capable of, she was fairly harmless. She certainly had some spunk, though, and was not terribly happy at being handled.



Here we have an adult female Brown Thrasher going through the paces: being fitted for a band, having her abdomen fat examined (how many of us would subject ourselves to that?), and being weighed.

I couldn't resist zooming in on this photo. Just look at this amazing bird. Isn't she beautiful? She was pretty docile in the hand, quite the opposite of what I've observed in the field. A breeding female is pretty territorial and will let you know when you've gotten too close to her nest. It was incredible to be able to see one this close.

A male adult American Robin. Based on the looks of his head feathers, I'd say he's in the process of molting. This Robin was special because he was a recapture (meaning he had already been banded by someone else). They didn't recognize it as one of the BSBO bands, so they had no way of knowing at that moment where it had been banded. All relevant measurements were recorded, and I'm sure they will submit the band number and info to U.S. Geological Survey. According to a pamphlet about banding available at the observatory, they only catch about 5 "foreign" birds (birds banded by another bander) per year. Pretty cool that we got to see one, huh?

This is one of my favorite photos of the entire morning. To me it encompasses the whole of the banding operation itself: seeing that data being entered by hand for each of the thousands of birds that pass through there, all the while having the bird in your hand while you capture its details. (For those wondering, that's a Swainson's Thrush in Mark's hand.)

Tomorrow we will look in detail at some of the other birds that were banded at the demo, and examine their field marks (in non-breeding plumage at that!). Stay tuned.

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