A study has investigated the changes in the songs of a population of Thrush Nightingale in Finland over a 33-year period. The ...

Bicknell’s thrush, Cassia crossbill, pink-footed shearwater, tricoloured blackbird and golden-cheeked warbler. Some of these birds already have protections under the US Endangered Species Act.

nor does the wood thrush, one of the latest species to be a part of monitoring and conservation efforts. Outfitted with what MassWildlife officials describe as a "backpack," the small birds are ...

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