Dolphin Dolphins

Only available on StudyMode
  • Topic: Dolphin, Cetacean intelligence, Cetacea
  • Pages : 3 (590 words )
  • Download(s) : 559
  • Published : September 12, 2009
Open Document
Text Preview
Dolphin

Dolphins are marine mammals that are closely related to whales and porpoises. There are almost forty species of dolphin in seventeen geaner. They vary in size from 1.2 m (4 ft) and 40 kg (90 lb), up to 9.5 m (30 ft) and 10 tonnes. They are found worldwide, mostly in the shallower seas of the continelnta shelves, and are carnivores, mostly eating fish and squid. The family Delphinidae is the largest in the Cetacea, and relatively recent: dolphins evolved about ten million years ago, during the Miocene. Dolphins are considered to be amongst the most intelligent of animals and their often friendly appearance and seemingly playful attitude have made them popular in human culture.

Behaviour

Dolphins are often regarded as one of Earth's most intelligent animals, though it is hard to say just how intelligent dolphins are, as comparisons of species' relative intelligence are complicated by differences in sensory apparatus, response modes, and nature of cognition. Furthermore, the difficulty and expense of doing experimental work with large aquatics means that some tests which could yield meaningful results still have not been carried out, or have been carried out with inadequate sample size and methodology. Compared to many other species however, dolphin behaviour has been studied extensively by humans, both in captivity and in the wild.

Sammary

Dolphin, it is an intelligent animal which are popular in human culture. Dolphin is mostly 40 spices that are large fish and living in shallower sea. There are eating fish and squid. There are friendly and playful appearance. We do experimental work to comparison each species as intelligence but difficult in some test act as sensory apparatus or response modes, so human has studied in wide knowledge behavior of dolphin.

Vocabulary

1. Porpoises (N.): A sea animal that looks like a large fish with a pointed mouth.

• Porpoises are similar to...
tracking img