The Blainville beaked whale is seen around the Canaries
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Environment correspondent Richard Black joins researchers on board the yacht Song of the Whale as they look and listen for whales around the Canary Islands.
Beaked whales are probably the least understood large mammals on the planet, but sound can help us track their mysterious movements.
THURSDAY 2 OCTOBER: STAR-GAZING
It was a late start for me today, having been up until the early hours on the night observation shift.
It was a rare chance to spend time with such beauty. But the attractions were very different from daytime.
In the Canaries' pristine air, the skies were bejewelled above our heads - and not just with stars, it seemed, but with the stuff between the stars.
It lay like floating silk on top of the visible world.
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