There are six “crossbill” species and only two breed in the Adirondacks, the red crossbill being one. Find them with these tips.

Many scientists believe the red-eyed tree frog developed its vivid scarlet peepers to shock predators into at least briefly questioning their meal choice. These iconic rain-forest amphibians sleep ...

When red-billed and yellow-billed finches mate, their offspring have orange ... These pigments are used in the retinas of their eyes, where tiny oil droplets containing carotenoids help filter ...

A large vireo, the red-eyed is one of the most common songbirds in eastern woodlands. It moves sluggishly through the canopy of broadleaf forests, making it hard to detect, and often picks food by ...