Narwhal in the 'Sea and its wonders' by Mary & Elizabeth Kirby, 1871. One of the featured in blog on 'Women and the blue planet' on the contributions of women to the development of marine zoology: https://t.co/GutUNOdazU.

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Sharks tended to "remember" locations with high food availability and return to those locations over time.

So much can be learned from tracking the movements of these amazing animals!

Photo: jchauser

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