The brain of a fly isn't much but there must be something going on in there. Yet even in these internet days its really difficult to find out much about the behaviour of St Mark's Fly. Bamburgh dunes were full of these black dangley-legged things today. Facts established: so called as they tend to emerge on St Marks day (April 25th); males have larger eyes than females (so that's a male in the top photo); males do an up and down flight to attract females.
- Is it just the males that dangle their legs in flight?
- If so, does the length of their dangling bits determine their mating success?
- If one emerged 2 days early would it be St George's Fly?