Notes: Dark plumage w. white sides to undertail.
Bill & forehead shield are primarily red w. a yellow tip.
When breeding, tarsus orange-red flush. Non-breeding adult: duller
colours, shrunken shield, red on tarsus fades to olive green or
yellow. Immature: dark bill w. trace of red & yellow. Swims
w. head jerk, tail high. Walks w. tail flicking. Two other ssp to N of
Aust, slightly smaller .