sparrows sitting on branches, red berries in the background.

house sparrow animal bird branch brown domesticus nature ornithology passer wild wildlife avian male passerine perched songbird alert alive avifauna birding creature endothermic english environment fauna feathers finch homeothermic invasive sitting tachymetabolic female tree little zoology living montanus passeridae winter vertebrate cute urban eurasian background horizontal black beautiful green species