Species: Black-headed Grosbeak
Most recent capture date: 5/23/2021
​Earliest capture date: 5/13/2018
Sex: Male
Age: 4 years old

Notes: You don’t often get to see a Black-headed Grosbeak’s secret yellow underwing. Our scientific understanding of bird coloration suggests that yellow/orange/red colors are costly to produce, so there must be some reason the grosbeaks bother to produce this patch of bright yellow, even if it’s usually hidden.