evening grosbeaks, which share a family with birds such as cardinals and rose-breasted grosbeaks, are native to the northern united states & canada, as well as some populations farther south. in winter, the northern populations migrate to warmer areas. both sexes of grosbeaks have yellow on the body, but females’ is paler, and they are overall more brown.
researchers discovered that, with some training, pigeons are capable of understanding the concept of mathematical values. pigeons can rank amounts from lowest to highest by pecking them on a screen. pigeons were able to successfully rank up to nine objects in order. their performance matched that of rhesus monkeys who had previously participated in the same experiment.
Only Seven Acres of Rose of Pollux's Musings & Daydreams 