Friday, March 16, 2012

Giant squid eyes are sperm whale defence

The world's biggest squid species have developed huge eyes to give early warning of approaching sperm whales.
The models showed that in general, there is no benefit to be gained from developing eyes bigger than the swordfish's.
The exception is a really large moving object.
Here, large eyes enable better detection of a pattern of point sources of bioluminescence - light given off by tiny organisms - in low-contrast conditions.
This would give the squid warning of a sperm whale approaching at a distance of about 120m, the researchers calculate - potentially allowing it to take evasive action and avoid being eaten.

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