Marine biologist Ilena Zanella vowed to save the shark after diving with them off Costa Rica.
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Helen Briggs
BBC Environment correspondent
Endangered species
Helen Briggs
BBC Environment correspondent
The future of the critically endangered Sumatran rhino has been struck a blow, with the death of Malaysia's last male.
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Jambi, who was 16, had been at Edinburgh Zoo since 2015 after arriving from Berlin Zoo.
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Matt McGrath
Environment correspondent
A compelling UN assessment shows the full picture of humanity's devastating impact on biodiversity and nature.
Read moreThe species has been in decline since the mid-1990s.
Possibly the last remaining female, the turtle was artificially inseminated 24 hours before dying.
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US researchers spot three mother and calf pairs of the endangered North American right whale species.
Read moreThe extremely rare Chinese giant salamander was rescued after an attempt to smuggle it into the UK.
Romeo, known as the world's loneliest frog, had spent 10 years living in isolation at an aquarium.
Nine boxes of rare animals were taken from a passenger by customs officials at Chennai airport in India.