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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...