Transcript Der Frosch
locomotion by jumping great importance in the ecologic system The frog • short and compact body, big eyes sidewise, long hind legs lives everywhere, except at Antarctica Table of contents • Progression • Catching prey • In winter and summer • Enemies • Locomotion Progression of the frog (Metamorphosis) spawn of frogs - about 2500 eggs in a cluster - each egg is situated in a (gelatinous) wrapping - this wrapping protects and provides food at the beginning tadpole - hatch out after 10 days - about 6mm long - breathing by gill-tufts - helmtail for locomotion gill-tuft helmtail tadpoles with legs at the front and the back - about 4 weeks old - gill-tufts degenerate - inner gills appear - first hind legs grow, then forelegs - helmtail degenerates - food: algae and water plants completely developed frogs - leaves water after 12 weeks of evolution - breathing through airbags - food: insects, amphibians, small fish - length: 5-10 cm - Goliathfrogs up to 60 cm long and 4 kg How to spend the winter: - in mud - in soil - in abandoned constructions of other animals frogs are hematocryal How to spend the summer: - in sand or clay (e.g. Australia) Locomotion nearly no neck no tail foreleg small and stron flashs hind leg long, muskulös sceletton is build in a manner to provide good swimming and jumping skills Catch of prey - sticky tounge is fastened at the front of the jaw - when spotting a prey it opens ist mouth - tongue unrolls and comes out relatively uncontrolled It has no teeth! Enemies cars mammals snakes storks water birds