THE SUFFIX -ID (OFFSPRING)
-id is a suffix that means "offspring". In the context of animals and plants, it refers to young offspring.
kato (cat) + -id = katido (kitten)
hundo (dog) + -id = hundido (puppy)
THE SUFFIX -IN (FEMALE)
When it comes to animals, the root form of the animal (i.e. bovo) is gender neutral. Therefore bovo can either be a bull or a cow. A bovino is specifically a cow. To make this unambiguously male, you need to add vir- in front of it, thus virbovo is a bull.