Birds and fish (plus many invertebrates) are not born alive in the way most mammals are, but hatch instead from eggs that their mothers have laid.
Hatching therefore is the “birth” of these animals.
A fregatebird about to hatch on BoatswainBird Island
Photo: Drew Avery, CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0), via Wikimedia Commons.
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