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Besides living in fresh water and on dry land, the adults of some species are adapted for living underground or in trees.
The skins of frogs are glandular, with secretions ranging from distasteful to toxic.
More than one third of species are considered to be threatened with extinction and over one hundred and twenty are believed to have become extinct since the 1980s.
The number of malformations among frogs is on the rise and an emerging fungal disease, chytridiomycosis, has spread around the world.
The skin is semi-permeable, making them susceptible to dehydration, so they either live in moist places or have special adaptations to deal with dry habitats.
Frogs produce a wide range of vocalizations, particularly in their breeding season, and exhibit many different kinds of complex behaviours to attract mates, to fend off predators and to generally survive.
They are also one of the five most diverse vertebrate orders.
The body plan of an adult frog is generally characterized by a stout body, protruding eyes, cleft tongue, limbs folded underneath, and the absence of a tail.
While this classification is largely accepted, relationships among families of frogs are still debated.
The origins and evolutionary relationships between the three main groups of amphibians are hotly debated.
A few species deposit eggs on land or bypass the tadpole stage.
Adult frogs generally have a carnivorous diet consisting of small invertebrates, but omnivorous species exist and a few feed on fruit.
Frogs are extremely efficient at converting what they eat into body mass.