I'm not a school teacher; ....... but, it's true most sounds bats make during echolocation occur beyond range of human hearing. Our normal (human) hearing range is about 20 Hz to 15-20 kHz, where most bat vocalizations occur in the 9 kHz to to 200 kHz range - so there is some overlap there. Obviously, we can hear bats making many sounds - those made by their claws as they move while at roost or the fluttering sound of their wings, either at roost or in flight. Most humans can hear some of the sounds made when bats are in echolocation mode, and almost anyone with normal hearing, if you describe what to listen for, can hear faint clicks on calm nights while insect-eating bats are nearby and in flight, the 'click sound' being part of the chirps used during echolocation. I don't consider my hearing to be all that sharp, but just last week I did observe some bats clicking as I stood quietly watching them while waiting for my dog to finish his chore in the gloaming. Too, from a short distance, people with normal hearing would have no trouble hearing some of the vocal communication that passes between mother and pup. Al

Neat! I wish I could manage to get frogs but I think there is too much poison used around us by people who worry about mosquitos, etc. The visitor we got is common outside of a city but I didn't expect it right here in the middle of town. We got a muskrat! It was such a delight to watch it do laps. We knew it would not be staying so we enjoyed it while we could. Sandy

Bulbosa is about the only one listed that can handle the moisture and still retain a somewhat small size. Brachycaulos may grow a wee bit too large. Shiedeana and edithae are very dry loving. Tenuifolia and baylii could handle (maybe) the moister tank but don't bet the farm on my word. Most of your plants like to dry out. Remota is kinda blah!, just sits there being small and insignificant. The only species I keep on the dryer side of moist are the terrestrial jungle species in pots. Constant moisture and lack of air circulation is the biggest killer of Tills I know. People should give their plants more 'tough love' than TLC. (IMHO)

The American Hyla cinerea or the Australian Litoria caerulea? I'd search the web for wholesale and retail reptile distributors, pet stores, and animal classifieds in your area. Mention if they are CB or wild caught. Breeders may tend to want sexed breeding size frogs as opposed to babies. Good luck.