My apologies for any repetitions - I cant be bothered to edit my list! - but all of the following are listed in Chambers Dictionary...wagtail, waldrapp (bird), waler (horse), wallaby, wallaroo (marsupial), walrus, wapiti (deer), warbler (bird), warrigal (dog), warthog, wasp, water (+beetle/rat/vole etc), waxwing, weasel, weever (fish), weevil (beetle), weka (bird), weta (grasshopper), whale, whap (bird), wheatear (bird), whelk, whelp, whimbrel (bird), whinchat (bird), whippet (dog), whippoorwill (bird), white (+admiral/ant/rhino etc), whiting (fish), wigeon (bird), wild (+cat, fowl etc), wildebeest, windhover (bird), witchetty-grub, wolf (+hound/spider etc), wolverine, wood (+ant/chat/mouse etc), worm, wrasse (fish), wren, wryneck (bird), wyandotte (bird).