From All About Birds: Adult males are brick red overall, with darker wings and tail. Females are mostly yellowish below, brownish or olive brown above. Immatures are brownish above, pale with brownish streaking below.
Red Crossbills eat conifer seeds and forage in flocks, which often fly in unison from tree to tree. Crossbills sometimes gather grit on the ground in the morning. Adult males perch on top of conifers to sing and watch for predators. Red Crossbills sometimes attend feeders that offer sunflower seed, especially in the West.