The mud-gulper lives largely on water plants which it dredges from the muddy bottom of rivers and lakes. On land the mud-gulper tucks its tail under its body.
As a signal to the opposite sex, the toothed kingfisher's beak changes colour early in the breeding season.
Normal coloration.
Breeding coloration
Although of recent aquatic origin the tree duck lives mainly on land.
The toothed kingfisher is not a swimming bird in the usual sense. It uses its wings rather than its feet - a method that is particularly successful under water.