Derek wrote but do the females not vocalize at all?

They will make alarm calls.
As in 'help! the humans, snakes, raccoons, herons, cats, dogs' are coming!

I've had a lady bullfrog around here for two summers and she never makes a
peep. A male treefrog showed up, called and called, and then
ominously stopped. I think the lady bullfrog had had enough noise and ate him
up...



kathy :-)
algae primer
http://hometown.aol.com/ka30p/myhomepage/garden.html