When I first picked up my newest batch of tree frogs, there was a considerable amount of chirping on the car ride home. Since putting the 3 newbies in their enclosure, I haven't heard ANYTHING in regards to chirping. Do they (or just a he) need time to adjust? Also, the bigger one that I got is very comfortable and tends to sit out in the open like my first frog does...the 2 smaller ones are ALWAYS hidden though. Will that change over time?