Dietary biology of the Eurasian eagle-owl but none are heavier than the largest mammalian prey that eagle-owls have taken including greater white-fronted goose ("Anser albifrons"), bar-headed goose ("Anser indicus"), great cormorant ("Phalacrocorax carbo"), Himalayan snowcock ("Tetraogallus himalayensis") and demoiselle crane ("Anthropoides virgo"), all averaging around , the swan goose ("Anser cygnoides"), the common crane ("Grus grus") and the (between the dimorphic sexes) great bustard ("Otis tarda"). Eurasian eagle-owls have also hunted adult male western capercaillie, which average about , although usually the much smaller females, at , are more regularly taken. Although they rarely take domestic birds, the range of sizes killed is just as dramatic,
Suchindram Theroor Birds Sanctuary trees and other bushes have formed an island at the centre, which gives refuge and is a resting place for birds. Suchindram is noted for the wide variety of migratory waterbirds that winter there, including: near threatened painted stork and spot-billed pelicans. Also seen here are cattle egrets, great cormorants, darters, purple swamphen, and bronze-winged jacanas. Resident raptors include pied kingfisher, brahminy kite and marsh harrier. Other water birds are dabchick, grey heron, garganey, purple heron, cinnamon bittern, open bill stork, cotton pygmy goose, whiskered tern and little tern, black-winged stilt, greenshank, little ringed plover and the common sandpiper In