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A species may be endangered or vulnerable, but not considered rare if it has a large, dispersed population. IUCN uses the term "rare" as a designation for species found in isolated geographical locations. Rare species are generally considered threatened because a small population size is less likely to recover from ecological disasters.
The family Balaenidae, the right whales, contains two genera and four species. All right whales have no ventral grooves; a distinctive head shape with a strongly arched, narrow rostrum, bowed lower jaw; lower lips that enfold the sides and front of the rostrum; and long, narrow, elastic baleen plates (up to nine times longer than wide) with fine baleen fringes.
A quarter of the world's maritime traffic passes through the Mediterranean, along extremely dense routes where ships – like marine species – are regularly concentrated by narrow straits (the Dardanelles, the Otranto Channel, the Strait of Messina, the Corsica Channel, the Sicily Channel, the Mouths of Bonifacio, the Corinth Channel and, of ...
Spade-toothed whales are the world’s rarest, with no live sightings ever recorded. ... marine technical adviser for the Department of Conservation, said. ... DNA sequencing in 2002 proved that ...
A mysterious shark that may count as the world’s largest predatory fish appears to be in decline off the U.S., prompting a rush to gather as much information as possible about the secretive ...
In practice, these marine protected areas are dedicated to the conservation of these species, although marine mammals are in many cases already covered by national conservation measures. Since the beginning of the 21st century, these large marine protected areas have signed cooperation agreements, encouraged by the NOAA [ 160 ] Sister ...
Following is a list of marine reptiles, reptiles which are adapted to life in marine or brackish environments. This list is incomplete ; you can help by adding missing items . ( August 2008 )
Endangered (EN) species are considered to be facing a very high risk of extinction in the wild. In September 2016, the International Union for Conservation of Nature (IUCN) listed 643 endangered fish species. [1] Of all evaluated fish species, 4.2% are listed as endangered. The IUCN also lists ten fish subspecies as endangered.