Birds like ducks, pheasant etc have a gender. Humans have a gender. Do any other mammals have a gender ?

Mosquitos fly in circles copulating, sometimes till they hit the ground. The female black widow spider eats the male after sex. (That's not cricket!)  ..I'm just saying even bugs have male & female. But you maybe meant something else by 'gender'? I dont really know. But I dont see why humans make so much fuss about sex. It needn't be such a deal that people have to have parades and polticial groups and seperated identities.

Live & Let Live should be enough said. Celebrate differences, dont condemn. Diversity makes us strong. To each his own.  An it harm no one do as ye will!

every animal has a gender even those of hermaphroditic construction have genders and I think only viruses and bacterium's don't have genders but I may be mistaken...

N.Shadows 

Gender is a social construct.

Non-human mammals don't have genders, just sexes, and the same goes for birds.

Humans have opposable thumbs,  gorillas have opposable thumbs, do all the other mammals have opposable thumbs?

@Merlinn - Sorry guy, but no, not all animals have genders. The common earthworm does not.  It holds both sexual organs and mates with other earthworms and they both have offspring.  There are other animals out there like this.

All animals have a gender.  This includes, mammals. fish, reptiles, amphibians, birds, insects and humans.