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grey seals
harp seals
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Cystophora cristata
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Ecology
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General Works
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Halichoerus grypus
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Phoca groenlandica
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Phoca vitulina
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Pseudoterranova decipiens
1
QH540-549.5
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harbour seals
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hooded seal
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parasites
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population dynamics
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ringed seals
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sealworms
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underwater colour vision
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