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
Bull sharks are mainly found in the warmer and shallower coastal waters of the southern hemisphere. The bull shark is one of the most common species of shark found worldwide.
The bull shark is able to inhabit both salt and freshwater sources just as happily, with one bull shark known to have swum 4,000 km up the Amazon River in South America, finally ending up in the mountainous Peru.
The bull shark is well known for its unpredictable and aggressive temperament and is thought to be one of the most dangerous sharks towards humans. This is probably because the bull inhabits coastal waters and rivers and is therefore more likely to come into contact with swimmers and water sports en
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African elephants are the largest land animals on Earth. They are slightly larger than their Asian cousins and can be identified by their larger ears that look somewhat like the continent of Africa. (Asian elephants have smaller, rounded ears.)
