How do seabirds judge the distance they need to dive into water to catch their food?

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Offline thedoc

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David asked the Naked Scientists:
   I was watching a tv programme (Natures Weirdest Events) where it got me thinking about...

How do seabirds which dive into the water to get their food manage to judge the distance before they dive?

The tv programme went on about certain frequencies of light, mainly Ultraviolet, causing fish, corels and other marine life to luminess in a frequency of light which we could not see, but under Ultraviolet light, this light luminessience, and could be seen under special equipment.

My question is :

Would seabirds which dive to get their food see this frequency of light, and are able to judge the distance as to how deep the fish is before either diving or not diving???
What do you think?
« Last Edit: 14/10/2016 13:53:01 by _system »