R.E. Johnson 1967 Journal May 12 Big Springs Canyon, Tilden Regional Park, Montana sunny, warm, still. Zoo 107B Field Trip (main objective - reptiles). Canyon is brushy & forested on north facing slope & open grassland on south slope. Ash-throated Flycatcher - calls from branches toward top of 50 ft. tree. (an uncommon migrant). Cedar Waxwings - numerous flocks seen in flight. Calif. Quail - calls heard often Mourning Dove Feral Cat - 2 young under a Calif. Sage bush (3x8x5ft) on grass south slope. Adult had flushed from nest. Black-headed Grosbeak - several singing vigorously from trees. Bewick Wren - common, singing Wren Tit - singing [about 4 or 5 wren tits & wrens appeared to be mobbing cat, when the cat is on the open slope away from its young]. One Wren-tit was seen to chase a nearby (4 ft) wren for 5 ft. Olive-sided Flycatcher Anna Hummingbird Plain Titmouse House Finch Steller Jay Wilson Warbler - very active, in willow tree.