Dodo

Dodos were a member of the pigeon family.  Dodos have gone extinct because their habitat was destroyed and it was an easy meal for hungry sailors.  And the sailors brought other animals to the islands, like goats, monkeys, and wolves.  And those ate dodo chicks and destroyed dodo habitats.  Dodos evolved to be flightless birds.  They ate rocks before they ate their food.  Dodos could not chew their food; they actually ate berries.  The rocks helped grind up the berries.