I have read that sight, smell, and the lateral line are all important. The reason I ask has to do with feeding my own frogs, Silurana tropicalis. They are in a large (350+ gallon) enclosure with plants and hiding spots. I seldom see the frogs, so hand feeding is not practical. If I simply drop earthworms in the water, is it likely that the frogs are finding them, even if they are not close enough to see them? They also get crickets and pellets.
Looking for input from experienced keepers.