On Sun, 2 May 2004 08:43:30 +0100, Jane Ransom
wrote:

In article , Diane Epps
writes
I made it formal with steep sides a
metre deep and have never had a problem. The herons come and look but can't
get at the fish.

You did put a bit of a ramp in it somewhere, didn't you, so that any
animals that climb in it can climb out again?

If you put a ramp in it the herons will use it.