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Zalambdalestes was an early mammal that lived throughout the late Cretaceous period

Zapsalis was a meat-eating dinosaur (a theropod) that lived during the Cretaceous era

Zatomus was a large meat-eating reptile that lived throughout the late Triassic period, about 225-208 million years ago.

Zephyrosaurus, it means "Zephyr's (god of the west wind) lizard," was a plant-eating dinosaur 6 feet (1.8 m) long. It had a minute head, flat cheek teeth, long legs, and small arms.

Zigongosaurus was a long-necked, herbivorous, saurischian sauropod dinosaur from the Jurassic era

Zizhongosaurus was a long-necked, long-tailed, quadrupedal plant-eater with a little head. It dates from the early Jurassic era, about 180 million years ago.

Zuniceratops was the initial ceratopsian dinosaur that had brow horns

Zygopophyses were interlocking bony structures on the back partly of the tails of tetanuran dinosaurs.

Zygorhiza was an archaeocete whale that lived throughout the late Eocene, about 40 million years before. This olden marine mammal had a long snout that enclosed many sharp teeth.