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Other than hunting, aquatic mammals can be killed as bycatch from fisheries, where they become entangled in fixed netting and drown or starve. Increased river traffic, most notably in the Yangtze river , causes collisions between fast ocean vessels and aquatic mammals, and damming of rivers may land migratory aquatic mammals in unsuitable areas ...
Cetacean stranding, commonly known as beaching, is a phenomenon in which whales and dolphins strand themselves on land, usually on a beach. Beached whales often die due to dehydration, collapsing under their own weight, or drowning when high tide covers the blowhole. [1] Cetacean stranding has occurred since before recorded history. [2]
Cetacea (/ s ɪ ˈ t eɪ ʃ ə /; from Latin cetus 'whale', from Ancient Greek κῆτος () 'huge fish, sea monster') [3] is an infraorder of aquatic mammals belonging to the order Artiodactyla that includes whales, dolphins and porpoises.
Dolphins, however, tend to remain horizontal, either on their belly or their back, and make the slap via a jerky whole body movement. All species are likely to slap several times in a single session. Like breaching, lobtailing is common amongst active cetacean species such as sperm, humpback, right and gray whales .
The Blue and White Dolphin (Stenella coeruleoalba) is one of the most common dolphin species in the Mediterranean: ships encounter an average of one every 4 km (or rather a group of ten every 39 km). [2] It's a small dolphin, measuring around 2 m and weighing 80 to 100 kg, and feeds on fish and squid.
One example of bycatch is dolphins caught in tuna nets. As dolphins are mammals and do not have gills , they may drown while stuck in nets underwater. This bycatch issue has been one of the reasons of the growing ecolabelling industry, where fish producers mark their packagings with disclaimers such as "dolphin friendly" to reassure buyers.
A female bottlenose dolphin performing with her trainer. They are considered one of the most intelligent cetaceans. Cetacean intelligence is the overall intelligence and derived cognitive ability of aquatic mammals belonging in the infraorder Cetacea (cetaceans), including baleen whales, porpoises, and dolphins.
Before extensive research on whale vocalizations was completed, the low-frequency pulses emitted by some species of whales were often not correctly attributed to them. Dr Payne wrote: "Before it was shown that fin whales were the cause [of powerful sounds], no one could take seriously the idea that such regular, loud, low, and relatively pure frequency tones were coming from within the ocean ...