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The table under Evolution of vomiting is especially interesting. Never saw vommiting pigeon!

• ars 18y ago
  I don't know if it counts as "vomiting" but it's how they feed the chicks, they regurgitate partially digested food. Before you get disgusted: some humans will chew food in the month to feed to a baby. And pigeons can't chew.
  • blogimus 18y ago
    The article explains the difference between vomiting and regurgitation. In general, vomiting is active and requires coordination of many muscles. Regurgitation is passive.
    • ars 18y ago
      Pigeon regurgitation is active though. They do it on purpose to feed a chick.