SPARROW
Small birds like sparrows usually hop, so their prints are in pairs.
Actual size
PIGEON
A walking, rather than hopping bird, so that the prints are alternate, and face inward (they really are pigeon-toed!)
Actual size
CROW
A perching bird, so a strong backward pointing toe. Crows have rough feet and leave a "jointed" print.
About half actual size
GULL
Webbed feet and pointed claws. The webs may be faint.
DUCK
Like the gull, but with claws and inward pointing tracks.
Actual size
COOT
Difficult to confuse with anything else - coots have lobed, not webbed, feet.
About half actual size
SWAN
Large webbed feet so couldn't be anything else except a duck in snow shoes.
About quarter actual size
HERON
Large and powerful. Although a water bird the foot is not webbed.
About half actual size