There, they see dinosaurs eat, hunt, rest, and fight. The kids discover that not all dinosaurs were huge - some were as small as rabbits. Arnold accidentally carries a fossil with him back in time, where it turns back into what it was originally - a dinosaur egg. Four Sometimes, animal remains trapped in stone dissolve away. That leaves an imprint fossil - a hollow imprint of the remains in the stone.
Footprints can also leave imprint fossils.
Place the objects in a paper bag. Give each student a lump of clay and a plastic bag. Let each student choose an object from the paper bag, without showing it to the others. Have them put their clay in the plastic bag and flatten it. Students press objects into clay through the bag.