British Invertebrates - terrestrial and freshwater

Leafy seadragons hatch from the male and will reach maturity within 2 years of life.
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The giant clam is the largest species of bivalve mollusc on fossil record and can weigh up to 300kg.
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The basking shark is the second largest fish in the sea, reaching up to 10 metres in length.
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Dusky dolphins are inquisitive creatures, as seen here investigating a southern right whale.
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Since the megamouth shark's discovery, only 17 sightings have been recorded of this elusive fish.
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