> as they'd have to move elsewhere!). And they certainly don't like the
> helicopter that lands near there, which doesn't look like any predator
> that I know of.

Well, helicopters almost look like DRAGONFLIES :-)

--
--------------------------------------------------
A bird in the bush is better than two in the hand.

Serge Le Huitouze Intelligent Software Group
email: serge at cs.sfu.ca School of Computing Science
tel: (604) 291-5423 Simon Fraser University
fax: (604) 291-3045 Burnaby, B.C., V5A 1S6 CANADA