Description: Would not come close, and I am allergic to water! Although I suspect that they would have vanished had I entered the water. They would probably have bitten my toes too ...
Description: I think they're called boatmen. They did an endless dance-like thing, at great speed skimming the surface of the dam first away from one another, then back. I saw one dive underneath the water as well. About 15mm long. Not easy to photograph!
