Cassin's Finches are small, somewhat round birds with a short, medium, and notched tail and a large conical bill made for eating seeds. Their wings are longer than most other finches and when perches, the tips of the wings come down to the middle of the tail. Adult males are rosy pink overall with vivid red on the crown. Female and fledgling Cassin's Finches are streaked with brown and white throughout their underparts. Both males and females show a dark brown backside with a streaked undertail.