Felidae is the biological family of the cats; a member of this family is called a felid. Felids are the strictest carnivores of the thirteen terrestrial families in the order Carnivora, although the three families of marine mammals comprising the superfamily pinnipedia are as carnivorous as the felids. The most familiar felid is the domestic cat, which first became associated with humans about 10,000 years ago, but the family includes all other wild cats including the big cats.
Extant felids belong to one of two subfamilies: Pantherinae (which includes the tiger, the lion, the jaguar, and the leopard), and Felinae (which includes the cougar, the cheetah, the lynxes, the ocelot, and the domestic cat).
The first felids emerged during the Oligocene, about 25 million years ago. In prehistoric times, there was a third subfamily known asMachairodontinae, which included the "saber-toothed cats" such as the well known Smilodon. There were also other superficially cat-like mammals, such as the marsupial sabertooth Thylacosmilus or the Nimravidae, which are not included in Felidae despite superficial similarities.
Birds (class Aves) are feathered, winged, bipedal, endothermic (warm-blooded), egg-laying, vertebrate animals. Around 10,000 living species makes them the most speciose class of tetrapod vertebrates. They inhabit ecosystems across the globe, from the Arctic to the Antarctic. Extant birds range in size from the 5 cm (2 in) Bee Hummingbird to the 2.75 m (9 ft) Ostrich. The fossil record indicates birds evolved from theropod dinosaurs during the Jurassic period, around 160 million years (Ma) ago.Paleontologists regard birds as the only clade of dinosaurs to have survived the Cretaceous–Paleogene extinction event 65.5 Ma ago.
Canidae (//)  is the biological family of carnivorous and omnivorous mammals that includes wolves, foxes, jackals, coyotes, and domestic dogs. A member of this family is called a canid (//). The Canidae family is divided into two tribes: Canini (related to wolves) and Vulpini (related to foxes). The two species of the basal Caninae are more primitive and do not fit into either tribe.