How old was your LO when they were to identify animals?

I mean like when there’s a couple animals in front of your child and you ask them “where is the cow” “where is the cat” and they’re able to point them out. How old was your child when they were able to do this? I don’t mean a couple animals, I mean all the “basic” zoo or farm animals. Cow, pig, chicken, dog, lion, or tiger. Things like that. I only ask because my son is 2 and he still isn’t able to point things out. Should I be worried?