Scientists learned that missing one of the two enzymes causes this mutation after studying feathers taken from the first yellow northern cardinal documented in the wild. That bird was “collected ...

A 2003 study analyzed the feathers of an individual yellow Northern Cardinal. This specific bird lacked all of these reg pigments that were derived from what it had eaten. The authors believed ...

Birding is also an excellent way to connect with nature during a season when outdoor activities may feel limited.