Beak of the Week - Bay-breasted Warbler

Bay-breasted Warbler (Setophaga castanea)
Family: Parulidae

When in doubt...look at the feet? Or at least that’s what you do when you are in doubt as to whether you are looking at a non-breeding female/young Bay-breasted or a Blackpoll warbler. Because these two can look very similar, biologists will use the distinctive blue-grey color of the soles to confirm the identities of Bay-breasted Warblers. Adult breeding males are dark grey on the top, with a white/cream-colored underside, and nape, white wingbars, and a reddish-brown crown, throat, and flanks. Adult breeding female Bay-breasted Warblers are less dark and have just a wash of the chestnut coloring.

Bay-breasted Warblers are mainly insectivorous, with a large portion of their diet consisting of spruce budworm. Since spruce budworms make up a large portion of the Bay-breasted Warbler’s diet, the prevalence of spruce budworm directly impacts Bay-breasted Warbler population sizes from year to year. Cape May, Blackpoll, and Blackburnian Warblers also feed on spruce budworms, but at different heights within the canopy, helping to reduce competition for food.

The fall migration path that a Bay-breasted Warbler takes, is often influenced by age. Adult birds will tend to migrate more on the western side of the migration route, while more immature birds will migrate more to the east. During migration, Bay-breasted Warblers use a wide variety of habitat types that differ from their preferred breeding habitat of boreal forest. Bay-breasted Warblers are at the tail end of their migration through the Upper Texas Coast on their way to the breeding grounds.

By Sarah Lefoley, Conservation Technician, Houston Audubon

Photos by Greg Lavaty
---
Visit our Bird Gallery to learn about other Texas birds.

Comments

How to DIY a Dripper for birds

Are you running out of home projects to keep busy during the quarantine? Here’s one my hubby made for me that you can try: a DYI Dripper. I’ve long wanted a bird dripper to complement my yard’s wildlife habitat, and with spring migrants on the way, I was keen to provide a drip that will attract new birds that don’t visit feeders. I had a problem though. There is no water line or power source near my feeders. The idea of stringing a hose or wire across the driveway just isn’t practical. Enter the engineer. My husband thought about the location and the limitations for a bit, and came up with the concept of sourcing water for a dripper off the sprinkler system. By using a toilet tank that fills every time the sprinklers run, water can be constantly available for the drip. I nixed the idea of a toilet tank sitting in my yard though, so he made some aesthetic modifications by installing a toilet tank float inside a 5 gallon bucket hidden inside a custom wooden box with a handsome copper p

Beak of the Week - Yellow-crowned Night-Heron

Yellow-crowned Night-Heron ( Nyctanassa violacea ) Family: Ardeidae Our Beak of the Week is the official Bird of Houston , the Yellow-crowned Night-Heron! This seemingly hunch-backed bird can be a difficult one to spot. Both species of North American night-herons, yellow-crowned and black-crowned, forage mainly at night and spend most of the day hidden among branches near a body of water. These two birds can be differentiated easily by their plumage on and around their head. The most obvious difference is stated in their names: Yellow-crowned Night-Herons have a yellow crown and Black-crowned Night-Herons have a black crown. But that’s not the only difference! Yellow-crowned Night-Herons have a black head and face with a distinct thick white cheek stripe, whereas Black-crowned Night-Herons have a black head with gray on their face that extends down the whole front of the body. Yellow-crowned Night Herons also have a gray front and neck, but it contrasts greatly with their facial patter

Beak of the Week - Ruby-throated Hummingbird

Ruby-throated Hummingbird ( Archilochus colubris ) Family: Trochilidae Did you know that Ruby-throated Hummingbirds are able to fly in all 6 directions with wing beats of 53 times per a second? Ruby-throated Hummingbirds are bright emerald or golden-green on the back and crown with gray-white underparts. Males have a brilliant iridescent red throat while females and immatures have fine, dark throat streaking. Ruby-throated Hummingbirds feed on the nectar of red or orange tubular flowers as well as at hummingbird feeders and sometimes tree sap. Hummingbirds also catch insects in midair or pull them out of spider webs. In preparation for their migration, Ruby-throated Hummingbirds double their weight from 3 grams to over 6 grams prior to departing. In the fall, millions of Ruby-throated Hummingbirds will pass through Texas on their migration to points south of the border with many crossing the Gulf of Mexico in a single flight. They arrive from breeding grounds as far away as Nova Scotia

Houston Audublog

Search This Blog