A fenestra is a natural hole or opening in a bone. The skull has many fenestra. Fenestrosaurus was named by paleontologist H. Osborn in 1924. It was a theropod dinosaur with a parrot-like head, toothless beak, long fingers, and long legs. FERN Ferns are non-flowering plants that were plentiful during the Mesozoic Era and usually live in warm, moist areas.
Ferns have fronds divided into leaflets.
The fibula is the calf bone - the bone in the lower, back part of the leg between the knee and the ankle. Their flowers are used in reproduction. Angiosperms evolved about 140 million years ago , during the late Jurassic period , and were eaten by dinosaurs. These are eaten by other carnivores. Many fossilized dinosaur footprints have been found.