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Piranhas are "basically like regular fish with large teeth". [19] A few other species may also occur in large groups, while the remaining are solitary or found in small groups. [3] Although popularly described as highly predatory and primarily feeding on fish, piranha diets vary extensively, [3] leading to their classification as omnivorous. [4]
Cartilaginous fish, such as sharks, do not have any of the bones found in the lower jaw of other vertebrates. Instead, their lower jaw is composed of a cartilaginous structure homologous with the Meckel's cartilage of other groups. This also remains a significant element of the jaw in some primitive bony fish, such as sturgeons. [11]
The first ancestors of fish may have kept the larval form into adulthood, as some sea squirts do today, although this path cannot be proven. Vertebrates , in other words the first fish , originated about 530 million years ago during the Cambrian explosion , which saw the rise in animal diversity.
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A lion biting another lion's tail as play behavior. Biting is an action involving a set of teeth closing down on an object. [1] It is a common zoological behavior, being found in toothed animals such as mammals, reptiles, amphibians, fish, and arthropods. Biting is also an action humans participate in, most commonly when chewing food. [1]
Methods of aggression in fish vary widely by species, but some common examples are chasing, charging, biting, fin display, color changes, and flared gills. [1] Aggression is an important evolutionary pressure that increases an individual's access to resources while reducing overall conflict within the social group. [ 2 ]
Having a highly mobile skull introduces a tradeoff between the ability to have high speed jaw opening (high kinesis) or higher bite transmission (lower kinesis). While there is a more complex relationship between mechanical advantage and the speed of lower jaw depression, [ 9 ] [ 10 ] [ 11 ] there is consensus that species using high-speed ...
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