Probably because in daily speech it's not that critical to know the term for many of these, such as baby horse. English is my native tongue and I never even heard of the word foal.
But if you're so inclined to learn them all, make flashcards and test yourself. It's not that difficult.
Good question. I think we should definitely know the difference for some of the more common animals like chien et chienne, but for the less common ones I don't know, unfortunately.
In my personal opinion I wouldn't get too hung up on this particular lesson unless you're planning on studying zoology or something in France. The vocabulary will come in time.
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