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"Giant insects ruled the prehistoric skies during periods when Earth's atmosphere was rich in oxygen. Then came the birds. After the evolution of birds about 150 million years ago, insects got smaller despite rising oxygen levels, according to a new study by scientists at the University of California, Santa Cruz."

The 15 largest active predators ever.

Rare & Extinct Creatures - Moa & Elephant Bird

The creature, named Darwinius masillae by the paper’s authors, lived an estimated 47 million years ago and is the first example of a previously unknown genus of primate. Thanks to @Monica Forghani Forghani Bianchi

Ammonite fossil: These creatures lived between 240 - 65 million years ago, when they became extinct along with the dinosaurs. 'ammonite' (usually lower-case) originates from the Greek Ram-horned god called Ammon. Ammonites belong to a group of predators known as cephalopods, which includes their living relatives the octopus, squid, cuttlefish and nautilus. Ammonites moved by jet propulsion, expelling water through a funnel-like opening to propel themselves in the opposite direction.

Animals of the past : an account of some of the creatures of the ancient world / Frederic A. Lucas ; American Museum of Natural History. (New York: [American Museum Press], 1922) archive.org/details/animalsofpastacc00lucauoft