Well, all Yoshis can lay eggs, but baby Yoshis usually don't hatch from those eggs. So maybe only female Yoshis can produce young? Male Yoshis' eggs would probably be only used for weapons.
"Like the moon over
the day, my genius and brawn
are lost on these fools."
-Bowser, SMRPG
Sometimes I dream about being carried off by a giant squirrel...Does that make me a nut?