The two species differ slightly in physical size pygmy sperm whale being slightly larger , morphology, and other minor features. Retrieved 10 January The increasing amounts of plastic and other debris at sea is currently threatening this, and many other species Bannister et al. Learn more about acoustic science. Predicted impacts of global climate change on the marine environment may affect Pygmy Sperm Whales, although the nature of impacts is unclear Learmonth et al. The flippers are broad, short, and located forward on the body. Parvorder Mysticeti Baleen whales.
ABSTRACT Using moored autonomous acoustic recorders to detect and record the vocalizations of social odonotocetes to determine their occurrence patterns is a non-invasive tool in the study of these species in remote locations. Phylogenomics of the killer whale indicates ecotype divergence in sympatry. The most optimistic mitigation of noise and contaminants would make the difference between a declining and increasing population, but would be insufficient to reach recovery targets. The whale's upper parts, and sometimes the flippers, are usually mottled.
In short, early humans were a randy bunch. A common breathing pattern in large whales is to breathe every 20 seconds for 8—10 breaths and then dive for about 10—15 minutes. Retrieved 15 June Further investigation found that, regardless of size, the cruising speed of most cetaceans is about 2 metres per second about 7 km, or 4 miles, per hour. There is one documented case in National Geographic Magazine of a blue whale being attacked by orcas off the Baja California Peninsula ; the orcas were unable to kill the animal outright during their attack, but the blue whale sustained serious wounds and probably died as a result of them shortly after the attack.
Other potential threats may include competition from expanding commercial fisheries in lower latitudes, particularly on pelagic squids, and from pollution leading to accumulation of toxic substances in body tissues, although these latter threats are likely to be low Bannister et al. Physeter Sperm whale P. South-east marine region profile: The body is mainly bluish gray with a lighter underside with possible yellowish vein -like streaks. They are not often sighted at sea, and most of what is known about them comes from the examination of stranded specimens. Rev Fish Biol Fisheries. Ziphiidae Beaked whales Berardius Arnoux's beaked whale B.