egg clutch of hooded crow

laying egglaying batch eggs egg clutch raft rafting deposition oviposition color variability pattern variegated spotting oology corvus cornix breeding ecology gray crow hooded hoodie hoody parasite animals passerine birds bird wildlife animal birding tour home nests zoology habitation nidology study nest jay guide structure ornithology synantropization stress tolerant species urban synanthropes tray shell eggshell crack