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Rodent-sized mammals were most common at this time.

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A large, flightless bird (ground bird) that has only three-four different types of bird within the species.

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Because there was a giagantic extinction in the period before the Paleogene period, mammels were mostly smaller animals, (smaller than 10 kg).

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Turtles, snakes, crocodiles, and lizards adapted to worm temperatures and bean living among the coastlines.
Many animals at that time that resembled rodents had teeth very much like rodents nowadays.

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The hyracotherium is a deer and horse like animal appeared during this period.

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This shows several types of animals in the Paleogene time. Notice the difference in looks between these animals and what they would look like nowadays. The hippo looking creature has several horns and is eating grass which means that it is a herbivore. There is also an animal that looks the mix of a squirrel and a panther. There is another hippo with no horns and a turkey looking bird eating a tiny panther looking animal.

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The titanis is a turkey like bird that was classified as a dinosaur in the Paleogene period. It cannot fly and eats meat. It only existed for about 3.1 million years.

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Whales also began during the Paleogene period. They were giant land animals that transformed over time into what are now known as whales!

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Rhinoceros and elephants appeared in this time period.

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Animals such as horses, bats, pigs primates (like gorillas), cats, and dogs began evolving around 65 million years ago and slowed their evolution around 2.03 million years ago.

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https://www.nationalgeographic.com/science/prehistoric-world/paleogene/

https://www.britannica.com/science/Paleocene-Epoch

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Since the climate began to cool and dry out, animals had to adapt into what they are today.

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The Paleogene Period is spread into three epochs; Paleocene, Eocene, and Oligodene epochs.

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The Paleogene period took place sixty five to twenty three million years ago at the beginning of the Cenozoic era, (therefore it is the oldest part of the Cenozoic era).

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43 million years long.
The period was in between the Cretaceous Period and the Neogene Period.

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The extinction of bigger animals helped to allow the small animals to thrive.

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The Paleogene period consisted of three epochs, the Paleocene Epoch, the Eocene Epoch, and the Oligocene Epoch.

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During the Paleogene, continents drifted apart. The climate was chilly and was dry. It was also known as tropical. Sea levels continued to drop. The temperature of oceans were killing numerous single-celled marine organisms. Forests also came about during this time.

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The eon and era was spanning between 23 and 26 million years ago.

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Bennettitales looks like a palm tree and is a seed plant.

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Climates cooled during the during the Paleogene period and seas along the shores retreated from North America early in the period.

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There was a land bridge between North America and Europe, (climates and regions were similar).

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The oceans finally separated the two regions during this period.

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It was there in the early Paleogene period. The first evidence of symmetrical flowers is found through these.

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Insect population increases such as bees and pollen, (because eof the bees).

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It's like a pine tree and common near the ocean.

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A tree known for its landscaping oaks and pollution tolerance.

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It's a tree that grows ball shaped nuts.

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This is a red maple tree known for its soft maple.

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Sea temperatures rose between 9 and 14 degrees Fahrenheit.