•GNATCATCHERS: Very small, slender gray birds with long tails and short, slender bills. Forage rapidly, flicking tail, and cocking tail over back.
GREBES: Robin to crow-sized diving birds that somewhat resemble ducks; some have face or head plumes; most have slender, spear-shaped bill. Seldom fly; often swim with body low in water and dive from surface.
•GROSBEAKS: Sparrow to robin-sized birds with stout, conical bills. Males brightly colored, females brown or greenish.
GULLS: Mainly white water birds with stout, very slightly hooked bills, long, narrow, pointed wings, and usually short, fan-shaped tails. Swim and feed at water surface; mob predators; rob food from other birds; larger species soar.
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HUMMINGBIRDS: Very small to sparrow-sized nectar-feeders with very long and needlelike bills. Usually hover at flowers with very rapid wingbeats and fly in a beeline.
JAEGERS AND SKUAS: Dark seabirds with bill gull-like but more hooked; wings long, narrow, pointed. Jaegers have long central tail feathers; skuas have short, fan-shaped tails. Flight erratic, but graceful and swallowlike in smaller species; all rob food from other birds.
•JAYS: Mainly blue birds with stout bills and rounded tails; some have pointed crests. Flight bounding; mob predators.
•JUNCOS: Small birds with short, conical bills and white outer tail feathers. Flush when disturbed. Dark-eyed Junco hops; Yellow-eyed Junco walks.
