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
Siamese crocodile (Crocodylus siamensis) is a small to medium-sized freshwater crocodile native to Indonesia (Borneo and possibly Java), Brunei, East Malaysia, Laos, Cambodia, Burma, Thailand, and Vietnam. The species is critically endangered and already extirpated from many regions. Its other common names include: Siamese freshwater crocodile, Singapore small-grain, cocodrilo de Siam, crocodile du Siam, buaja, buaya kodok, chorakhe nam chuet, and soft-belly.
The Siamese crocodile is a medium-sized, freshwater crocodilian, with a relatively broad, smooth snout and an elevated, bony crest behind each eye. Overall, it is an olive-green colour, with some variation to dark-green. Young spe
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The Magellanic penguin is a small to medium sized species of penguin found inhabiting the rocky islands off the coast of parts of South America. The Magellanic penguin is most closely related to the African penguin, the Galapagos penguin and the Humboldt penguin which it is similar in appearance to. Despite being classed as a threatened species, the Magellanic penguin is one of the most numerous of all of these types of penguin.
The Magellanic penguin is found breed off the coast of Argentina and southern Chile and on the Falkland islands further south. Like other species of penguin the Magellanic penguin spends the majority of it's time hunting for food in the surrounding ocean, comin
