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Swimming behaviour in mantas differs across habitats: when travelling over deep water, they swim at a constant rate in a straight line, while further inshore they usually bask or swim idly around. Man more→tas may travel alone or in groups of up to 50. They may associate with other fish species as well as sea birds and marine mammals.
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Rattlesnakes can grow from 1 to 8 feet long, depending on the species. They all have patterned skin, but their color can vary. All rattlers have a triangle shaped head and eyes with a black slit. Ratt more→lesnake venom is poisonous to humans, but they're not trying to hurt us. They would rather be left alone. They usually only strike if they're scared or startled.
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Scientists are unsure of the source of poison dart frogs' toxicity, but it is possible they assimilate plant poisons which are carried by their prey, including ants, termites and beetles. Poison dart more→frogs raised in captivity and isolated from insects in their native habitat never develop poison.
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As elephants do today, the woolly mammoth had enormous tusks which would have been used for both digging and collecting food, and for intimidating and fighting off both predators and rivals. The tusks more→of the woolly mammoth were often quite dramatically curved and could easily be up to 5 meters (16ft) long.