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Examples observed include:
- extra toes on horses, as in archaic horses
- reemergence of sexual reproduction in Hieracium pilosella and Crotoniidae
- Teeth in chickens
Examples in humans
Atavisms have been observed in humans as well. Babies have been born with a vestigial tail, called “coccygeal process”, “coccygeal projection”, and “caudal appendage”. It can also be evidenced in humans who possess large teeth, like those of other primates.