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Page last updated at 10:57 GMT, Friday, 27 November 2009
Scalloped hammerhead shark
A hammerhead shark's unusual shape gives it outstanding vision, according to a study which may solve a centuries-old mystery.

The chirps and whistles of birdsong can help to provide an accurate estimate of the size of bird populations.

Deep under the Antarctic ice, a rare colourful burst of starfish and monster worms is filmed by BBC camera crew.


IN PICTURES
Intimate images of the struggle to raise offspring.
Guarding Nepal's one-horned rhino from poachers.
This week's weird and wonderful sightings.

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Siberian tiger (WCS) Siberian tiger in severe decline
The last population of Siberian tigers has declined significantly.
Lobster larva Seamount diary: November 2009
Week two of an expedition to explore underwater seamounts.
Japanese macaques (Macaca fuscata) Grandparent monkeys' baby care
Macaques care for their abandoned grandchildren, a novel behaviour.
'Stevie Wonder', the blind wild boar in the Forest of Dean Gloucestershire's blind wild boar
A visually-impaired wild boar is cared for in the UK's Forest of Dean.
Giraffe (Giraffa camelopardalis) Giraffes use 'supercharged' heart
Giraffes use a small, supercharged heart to pump blood up their neck.
A QUESTION OF LIFE
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