|Mallards at Fairmount Park|
Mallards, Anas platyrhynchos
hybridize, or are crossbred, with other species of ducks,
resulting in some strange looking critters!
These are the true mallards, male with the green head:
Males have curled up tail feathers:
Females are brownish with colored patches under the wings.
Below is a hybrid mallard.
It is a male -- curled up tail feathers and green head -- with a crest: