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Sharks possess brain-to-body mass ratios that are similar to mammals and birds, [89] and have exhibited apparent curiosity and behavior resembling play in the wild. [90] [91] There is evidence that juvenile lemon sharks can use observational learning in their investigation of novel objects in their environment. [92]
The monotreme platypus has what looks like a bird's beak (hence its scientific name Ornithorhynchus), but is a mammal. [38] However, it is not structurally similar to a bird beak (or any "true" beak, for that matter), being fleshy instead of keratinous. Red blood cells in mammals lack a cell nucleus.
Marine mammals are mammals ... Killer whales have been known to paralyze great white sharks and other sharks and ... may forage with cetaceans and sea birds. [34 ...
The tough part is that fish cannot be compared to other species, she said, like mammals or birds. ... Sharks and rays do not possess nociceptors, which Zangroniz said is key for transmitting the ...
Mr Tabor adds that marine mammals “spend much more time in the sea than we do on beaches, so are far more likely to be prey,” and so, “global warming and habitat damage can move marine ...
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Ferreira describes the four encounters with the giant shark he participated in with great detail in his book Great White Sharks On Their Best Behavior. [79] One contender in maximum size among the predatory sharks is the tiger shark (Galeocerdo cuvier). While tiger sharks, which are typically both a few feet smaller and have a leaner, less ...
Having the ability to keep their warmth helps them as predators as well. Another group of sharks, known as the mackerel sharks are able to warm their blood. These mackerel sharks retain their blood by using a heat exchange system called rete mirabile. The body temperature of mackerel sharks can be up to 10 o higher than the surrounding water. [10]