Is this Pokemon? Or the animal world?
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Dinosaurs hatched from eggs.
A hen sits on and hatches a clutch of eggs; when they are hatched they are simply a flock.
Dumbo Octopuses are hatched from eggs.
There isn't just one type of animal, hun. Every single mammal. :)
A group of eggs/chicks laid or hatched together is often referred to as a "hatch", "brood" or "clutch".
They are hatched from eggs.
hatched from eggs
Both are hatched from eggs. Neither are mammals
All insects are hatched from eggs. The only method by which insects reproduce is by laying eggs.
fish