My gray treefrogs pretty much ignore each other, and treat each other as furniture.
However, having another frog in there reduces the chances that any crickets will go unnoticed and manage to hide somewhere in the cage, die, and stink up the place. This is justification enough for adding another gray treefrog to the party. Maybe a female would be best if your (hyla's) husband isn't on board with the frogs. A male calling might be an irritant (my girlfriend and I quite enjoy the calling though).
This would make a great Disney movie. Especially if directed by a frog.





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I have worked with people who associate emotions and animals so close as to make themselves ill. We see this in a well-known animal defense group where members relive ie. resuffer perceived abuse and treatment of creatures. A level head and complete knowledge of animals and their behavior must be learned before defending their status.
It's always nice to have a pair or trio of any critter in an enclosure and if they don't eat each other, get adequate amounts of food and find their comfortable space then all is right in their world.
