Sharks are a group of fish characterized by a cartilaginous skeleton, five to seven gill slits on the sides of the head, and pectoral fins that are not fused to the head. Modern sharks are classified within the clade
Selachimorpha (or Selachii) and are the sister group to the rays. However, the term "shark" has also been used for extinct members of the subclass Elasmobranchii outside the Selachimorpha, such as Cladoselache and Xenacanthus, as well as other Chondrichthyes such as the holocephalid eugenedontidans. Under this broader definition, the earliest known sharks date back to more than 420 million years ago. Acanthodians are often referred to as "spiny sharks"; though they are n
Old World vultures are vultures which are found in the Old World, i.e. the continents of Europe, Asia and Africa, and which belong to the family Accipitridae, which also includes eagles, buzzards, kites, and hawks.
Old World vultures are not closely related to the superficially similar New World vultures and condors, and do not share that group's good sense of smell. The similarities between the two groups of vultures are due to convergent evolution rather than a close relationship. They were widespread in both the Old World and North America, during the Neogene. Old World vultures are probably a polyphyletic group within Accipitridae, with palm-nut vulture, Egyptian vulture and lammer
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The avocet is a type of wading bird that is found across mudflats in the world's warmer climates. There are four different species of avocet which are the Pied avocet, the American avocet, the Red-necked avocet and the Andean avocet.
The avocet is generally found in watery habitats close to the coast including marshland, wetlands and swamp. The exact habitat of the avocet is dependent on the species as the Pied avocet is found in Europe and Asia, the American avocet is found on the Pacific coast of North America, the Red-necked avocet in Australia and the Andean avocet is natively found nesting high up in the Andes Mountains.
The avocet is a very distinctive looking bird due to t
