it iis called a cob for both male and female
Female "pen", male "cob".
A male swan is called a cob.
Cob
A male swan is called a cob and a female swan is a pen.
A male cob is simply a male cop whose p went up
cob
cob
The female swan is called a pen and the male swan is called a cob.
Cob
They are cygnets.
cob