a fin-footed, fish-eating mammal, typically sleek-bodied and barrel-shaped
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Seals can hold their breath for nearly two hours underwater.
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shark, sharks
[ʃɑː(r)k]
(noun)
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Definition:
a type of fish with a full cartilaginous skeleton and a highly streamlined body, diversifying into 440 species, found in all seas and common down to depths of 2,000 metres (6,600 ft)
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The shark's survival is under serious threat from fishing and other human activities.
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whale, whales
[weɪl]
(noun)
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Definition:
a marine mammal with forelimbs modified as fins, a tail with horizontal flukes, and nasal openings on top of the head, ranging in size from the blue whale, the largest animal known to have ever existed at 35 m (115 ft) and 150 tonnes (150 lbs), to various smaller species
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Whales collectively inhabit all the world's oceans and number in the millions.
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tortoise, tortoises
[tɔː(r)təs]
(noun)
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Definition:
land-dwelling reptiles, varying in size from a few centimeters to two meters and shielded from predators by a shell
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Female tortoises dig nesting burrows in which they lay from one to thirty eggs.
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Synonym(s):
turtle
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shell, shells
[ʃɛl]
(noun)
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Definition:
a hard, protective outer layer, that was created by a sea creature, a marine organism
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There is often a surprising degree of variation in the exact shape, pattern, ornamentation, and colour of the shell.
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dolphin, dolphins
[ˈdɒlfɪn]
(noun)
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Definition:
an aquatic mammal closely related to whales and porpoises, inhabiting mostly the shallower seas of the continental shelves, famed for its intelligence and occasional willingness to approach humans
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Dolphins can hear frequencies ten times or more above the upper limit of adult human hearing.
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fish
[ˈfɪʃ]
(uncountable noun)
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Definition:
a cold-blooded vertebrate animal that lives in water, moving with the help of fins and breathing with gills
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They have many fish in their aquarium.
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