The Dusky Dolphin is a small species of dolphin that is found inhabiting the cooler waters along continental shelves throughout the southern hemisphere. This distinctive looking cetacean is closely related to other large marine animals including other dolphins, porpoises and whales but despite their fish-like appearance Dusky Dolphins are true mammals that both breathe air in and out of their lungs and also suckle their young on milk produced by the mother's mammary glands. Dusky Dolphins are widespread throughout the southern hemisphere with three species being recognised that have been grouped by their geographical range, with one found off the coast of South America, one near South Africa
The glass lizard (also known as the glass snake and the jointed snake) are a group of reptiles that resemble snakes, but are actually lizards. Although most species of glass lizard have no legs, their head shape and the fact that they have movable eyelids and external ear openings identify them as lizards.
Glass lizards are found all around the world although, the greatest number of species in the genus are native to Asia, from India to China and the Indonesian islands. At least one species, the Moroccan glass lizard, comes from North Africa, and several species live in the south-eastern United States including the barrier islands off the Atlantic coast of Florida. The glass lizard is
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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
