: Hatchling - Juvenile
: Herd (Herbivore - Plant eaters)
: Pack (Carnivore - Meat eaters)
Dinosaurs became extinct around 65.5 million years ago, during the K-T extinction event . Many animal and plant species were lost during this period. Alligators and crocodiles are obvious relatives of dinosaurs but todays 10,000 species of birds are their nearest relatives.