AMPHIBIANS

Frogs are the most noticeable amphibians in and around the backwaters of the Lobau, especially in the Spring when the males are trying to attract a female for mating. The croaking call is amplified by vocal sacs and since the frogs often croak in chorus, the sound can be overwhelming, giving a wonderful jungle feeling. Later, when the metamorphosis of the tadpoles is complete, the little froglets may be seen jumping about in the high grass on the banks and in the surrounding meadows.

Some basic biology – short and simple!

Amphibians are vertebrates(with a skeleton similar to our own based on a vertebral column/spine, skull at one end, tail at the other, ribs and 4 limbs. They are cold blooded that is, their body temperature varies with that of the environment. Their skin may be dry and leathery (toads) or soft and moist.

Most amphibians lay their eggs into water where the male then sprays its sperm over them (external fertilization). A mating ritual ensures the procedure is co-ordinated, the male stimulating the female to lay her eggs, then covering them immediately with his sperm. As soon as this is done, a jelly-like protection swells around the eggs (spawn). The parents generally take no further interest in their young.

The hatchlings (juvenile stages) are larval forms, very unlike the adult and as they grow they undergo a series of changes (metamorphosis).