Hey Chris, Why don't you mail order some traps? Beavers usually (in Texas) have regular trails. Set them there.
On herons, I noticed an ad in a fish pond magazine the other day for a heron decoy. Supposedly, they are very territorial and other birds (supposedly) will stay away. Take a look at the links area at the front of Pond Boss.
Did you ever find the liquid fertilizer?
Dave
