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| Green Iguana at London Zoo |
A photo of a
Green Iguana at London Zoo. Although this one is extremely and obviously green, apparently these iguanas come in a range of colours, from
multicoloured to
red. These iguanas are pretty awesome; they have an
extra photosensory organ on the top of their heads which is known as the
parietal eye. While it's nowhere as developed as their actual eyes, it can detect movement and changes in light and dark, thus helping the iguana to detect predators coming in from above - a useful feature in a tree climbing lizard. Their actual eyes are able to see into ultraviolet wavelengths, so the iguana is easily able to ensure it gets enough UV light to produce sufficient vitamin D.
It's admittedly not an amazing photograph, but it's darn tricky getting a good picture through a scratched glass tank!
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