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Different fish swim by undulating different parts of their bodies. Eel-shaped fish undulate their entire body in rhythmic sequences. Streamlined fish, such as salmon, undulate the caudal portions of their bodies. Some fish, such as sharks, use stiff, strong fins to create dynamic lift and propel themselves.
Hydrocynus vittatus. Several species belonging to the genus Hydrocynus of the family Alestidae are referred to as "tigerfish", and are particularly prized as game fish.These African fish are found in many rivers and lakes on the continent and are fierce predators with distinctive, proportionally large teeth.
Fish locomotion is the various types of animal locomotion used by fish, principally by swimming. This is achieved in different groups of fish by a variety of mechanisms of propulsion, most often by wave-like lateral flexions of the fish's body and tail in the water, and in various specialised fish by motions of the fins .
National Geographic spotlighted its Pictures of the Year in its December 2024 issue.. The photos include captivating images of animals, nature, scientific innovation, and landscapes. Photo editors ...
The liger is the offspring of a female tiger and a male lion and the tigon the offspring of a male tiger and a female lion. [45] The lion sire passes on a growth-promoting gene, but the corresponding growth-inhibiting gene from the female tiger is absent, so that ligers grow far larger than either parent species.
A very unusual trio has formed at an animal sanctuary in Georgia. Here's how Baloo the bear, Leo the lion and Shere Khan the tiger met. "13 years ago, the trio of cubs was found in an Atlanta drug ...
The Jordan bream is a species of fish endemic to the rivers and lakes of the Jordan River basin. It has been introduced to several lakes and reservoirs in the region including the Azraq Wetland Reserve, although this oasis in the eastern desert is drying up because excessive quantities of groundwater are being extracted. [16]
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