Penguin cartoons. Penguins at a fancy dress party, wearing drag.
A cartoon showing penguins wearing drag at a penguin fancy dress party – they look no different to normal, as male and female penguins look identical and indistinguishable from each other.
The problem for penguins as female impersonators, as there are no obvious (to humans) sexual identifiers or distinguishers between the sexes of penguins.