Pretty amazing story:
QUOTE
A species of moth drinks tears from the eyes of sleeping birds using a fearsome proboscis shaped like a harpoon, scientists have revealed. The new discovery – spied in Madagascar – is the first time moths have been seen feeding on the tears of birds.
Copied this image to Brainsturbator, so it's not hotlinking -- I forget if that even matters here, but either way:
QUOTE
Tear-feeding moths and butterflies are known to exist elsewhere in Africa, Asia and South America, but they mainly feed on large, placid animals, such as deer, antelope or crocodiles, which cannot readily brush them away. But there are no such large animals on Madagascar.
...sleeping birds have two eyelids, both closed. So instead of the soft, straw-like mouthparts found on tear-drinking moths elsewhere, the Madagascan moth has a proboscis with hooks and barbs “shaped like an ancient harpoon”, Hilgartner says.
This can be inserted under the bird’s eyelids, where the barbs anchor it, apparently without disturbing the bird. The team does not yet know whether the insect spits out an anaesthetic to dull the irritation. They also want to investigate whether, like their counterparts elsewhere, the Madagascan tear-drinkers are all males who get most of their nutrition from the tears.
...sleeping birds have two eyelids, both closed. So instead of the soft, straw-like mouthparts found on tear-drinking moths elsewhere, the Madagascan moth has a proboscis with hooks and barbs “shaped like an ancient harpoon”, Hilgartner says.
This can be inserted under the bird’s eyelids, where the barbs anchor it, apparently without disturbing the bird. The team does not yet know whether the insect spits out an anaesthetic to dull the irritation. They also want to investigate whether, like their counterparts elsewhere, the Madagascan tear-drinkers are all males who get most of their nutrition from the tears.
How in the world did one creature develop in such a way that it would feed on the tears of another animal which would also have been in the process of evolving? 