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
The giant clam is the largest immobile mollusc in the world, with the occasional giant clam individual reaching nearly 6ft in length. Once the giant clam has settled somewhere the giant clam remains there for the rest of its life.
Giant clams are founded anchored to the coral reefs in the warm, tropical waters of the Indian and South Pacific oceans, where giant clams spend the majority of their time feeding on the abundant variety of food that a coral reef has to offer.
Due to the large size of the giant clam, there have been reports of giant clams eating human beings. Despite this though, no reports of man-eating giant clams have ever been verified as it is thought that the gian
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The Galapagos tortoise (giant Galapagos tortoise) was first documented by Charles Darwin last century when he went on his trip to the Galapagos islands.
The Galapagos Tortoise is the biggest species of tortoise in the modern world with some Galapagos tortoises reaching more than 4ft long! The Galapagos tortoise is also one the longest living species of tortoise with a number of Galapagos tortoises getting older than 150!
The Galapagos tortoise, like most other species of tortoise, is a herbivore spending its time grazing on grass and low trees. Today only 10 out of the 12 Galapagos tortoise species still exist on the Pacific islands due to the introduction of goats a few hundred
