Wood Thrush
Hylocichla mustelina
eBird describes the Wood Thrush this way: Boldly patterned thrush is bright rusty-brown above with black spots on the white belly. Smaller than a robin, but larger than Hermit Thrush. Sticks to wooded areas, often hopping on the ground. More often heard than seen: listen for its incredible, flute-like song. Population is declining; winters in Central America. All About Birds offers this description of the Wood Thrush: The Wood Thrush’s loud, flute-clear ee-oh-lay song rings through the deciduous forests of the eastern U.S. in summer. This reclusive bird’s cinnamon brown upperparts are good camouflage as it scrabbles for leaf-litter invertebrates deep in the forest, though it pops upright frequently to peer about, revealing a boldly spotted white breast. Though still numerous, its rapidly declining numbers may be due in part to cowbird nest parasitism at the edges of fragmenting habitat and to acid rain’s depletion of its invertebrate prey.
I saw my first Wood Thrush at Quintana Neotropical Bird Sanctuary on the morning of April 18, 2021. I also saw several more of these beautiful birds while visiting Sabine Woods on April 20, 2021. I wish all birds were as cooperative with taking photos as the Wood Thrush! To see my bird blog that covers the trip that includes my visits to Quintana and Sabine woods, look here.
“Cool Facts” About the Wood Thrush From All About Birds:
- A songbird like the Wood Thrush requires 10 to 15 times as much calcium to lay a clutch of eggs as a similar size mammal needs to nurture its young. That makes calcium-rich food supplements like snail shells crucial to successful breeding. These are rare in soils subject to acid rain, which may help explain patterns of population decline in the Wood Thrush.
- Wood Thrushes are vulnerable to nest parasitism by Brown-headed Cowbirds, which lay their eggs in other birds’ nests. Some species refuse to raise these eggs, but Wood Thrushes accept them as their own. In some Midwest forest edge habitats, virtually every Wood Thrush nest contains at least one cowbird egg.
- The Wood Thrush is a consummate songster and it can sing “internal duets” with itself. In the final trilling phrase of its three-part song, it sings pairs of notes simultaneously, one in each branch of its y-shaped syrinx, or voicebox. The two parts harmonize with each other to produce a haunting, ventriloquial sound.
- In many songbird species, males square off by “song matching”: they answer a neighbor’s song with the same song, perhaps seeing which male can perform it best. Wood Thrush males are different. They almost always answer a rival’s song with a different one.
- The male Wood Thrush does more feeding of the chicks than the female, freeing her up to start a second brood. After that next brood fledges, the pair divides them up and feeds them at separate sites in the territory.
- Though pairs raise broods together, fooling around (or “extra-pair copulation”) is common. At some sites, as many as 40 percent of a female’s young are not fathered by its mate.
- The Wood Thrush’s scientific name Hylocichla mustelina translates roughly as “weasel-colored woodland thrush.”
- The oldest known Wood Thrush was a male and at least 10 years, 2 months old when he was recaptured and rereleased during banding operations in Connecticut in 2010. He had been banded in the same state in 2002.