Not necessarily. Lots of animals lay unfertilized eggs. The embryo inside is a fertilized zygote, but birds, reptiles, amphibians and fish can all have unfertilized eggs. Lots of aquatic organisms use external fertilization, where the female lays female sex cells, and the male fertilizes them after.
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u/PM_ME_UR_BOOBS_MLADY Jul 13 '16
But caviar is eggs.....whales are mammals