Inteligent flies?

No...not a trouser that automatically does itself up! ARF ARF ARF
(C) John House, all rights for this increadible joke reserved.


I was sitting eating my lunch in the house earlier and along came a fly through the window.

It flew in, bold as brass.

It looked around, by doing a circular fly of a meter or so.

It then turned round and flew right back out the window.

NOW - how come some flies can do that and others come in then bang their head against the open window for days until the die, never finding their way out?


Do flies have differing inteligences or are some just really lucky?