Each station is surveyed for 3 minutes. Best weather conditions for surveying are when it is warm, a little wet and fairly calm. Nights that are damp, hazy, foggy or have a light rain falling are ideal. Record the number of individuals that you count or estimate are calling by species. This makes them more sensitive to the loss and degradation of habitat.
Frogs spend their lives both in water and on land.
These major changes in form occur under the control of hormones. Frogs breathe through their skin - perhaps toxic heavy metals and pesticides building up in aquatic food chains, plus air pollution may be killing some frogs. Unknown cause for decline. Two species of toads in the Great Lakes basin. Toads are mainly terrestrial, but make their way to water to breed in the spring.