Some of the most interesting things are small and that includes the animal kingdom. Photography speaking, the only problem with small animals is that they are harder to photograph. Throw the low lighting of an indoor setting and the difficulty of photographing them just increased.
These little (I mean tiny) tree frogs were recently seen at the Texas State Aquarium. It’s too crowded to bring a tripod, so a monopod, braced up against the glass is about all you can hope for for support during the longer shutter speed. Pray that the subject doesn’t move and take a few shots, just in case.