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The Giraffidae are a family of ruminant artiodactyl mammals that share a recent common ancestor with deer and bovids.This family, once a diverse group spread throughout Eurasia and Africa, presently comprises only two extant genera, the giraffe (between one and eight, usually four, species of Giraffa, depending on taxonomic interpretation) and the okapi (the only known species of Okapia).
Some biologists suggest the modern giraffes descended from G. jumae; [10] others find G. gracilis a more likely candidate. G. jumae was larger and more robust, while G. gracilis was smaller and more slender. [6] The changes from extensive forests to more open habitats, which began 8 mya, are believed to be the main driver for the evolution of ...
The sauropods and giraffes independently evolved long necks. [ 74 ] The horned snouts of ceratopsian dinosaurs like Triceratops have also evolved several times in Cenozoic mammals: rhinos , brontotheres , Arsinoitherium , and Uintatherium .
On the Origin of Species (or, more completely, On the Origin of Species by Means of Natural Selection, or the Preservation of Favoured Races in the Struggle for Life) [3] is a work of scientific literature by Charles Darwin that is considered to be the foundation of evolutionary biology.
There are several carnivores that prey on them, including large cats (e.g., lions) and bears. Other predators are crocodiles, wolves and dogs, large raptors, and for small species and young animals, large snakes. For cetaceans, possible predators include sharks, polar bears, and other cetaceans; in the latter is the orca, the top predator of ...
The naming of hybrid animals depends on the sex and species of the parents. The father giving the first half of his species' name and the mother the second half of hers. (I.e. a pizzly bear has a polar bear father and grizzly bear mother whereas a grolar bear's parents would be reversed.)
Most of the first season focused on the relationships between employees at The Beef before Carmy turned it into a Chicago hot spot called The Bear. Season 2 offered viewers more of a glimpse at ...
Some scientists believed that modern ungulates were descended from an evolutionary grade of mammals known as the condylarths. [24] The earliest known member of this group may have been the tiny Protungulatum , a mammal that co-existed with the last of non-avian dinosaurs 66 million years ago. [ 25 ]