They all croak, therefore they are males. I can recognize each one by sound alone, so they sound slightly different. A very rainy, warm day will start them croaking.

What time of year do tree frogs start croaking?

Tree frogs are mainly found croaking during mating season. Their mating season is mainly summer and spring, especially after a springtime rain. Their reproductive stimulations are closely associated with rain. Male frogs start croaking to attract female frogs.

What does it mean when green tree frogs croak?

For many local residents, the non-stop croaking is an annual cue about the change of season. For the frogs, it is a bit more base level. "It's males calling and they're calling to attract females," ecologist Dr Graeme Gillespie said. "It's instinctive.