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Tree swallows in the northern U.S. and Canada face the greatest risk from climate change despite responding to temperature the same way as tree swallows in the southern U.S.

Warming temperatures cause tree swallows to nest up earlier than they once did, but early spring cold snaps can hinder nestlings’ growth and survival.

When a bird drapes its nest with snake skin, it isn’t just making an interesting home décor choice. For some birds, it keeps predators at bay.

In an adaptation to climate change, tree swallows have become smaller over the last three decades, an ongoing study based in Tompkins County has found.

When they analyzed breeding and hormone data, the team found a negative relationship between the temperature during the birds’ development and their hormonal response to stressors as adults. Specifically, they found that colder temperatures...