Wednesday, February 27, 2013

frog defnece mechanisms

Frog Defence Mechanisms

Research into several frog species has produced recite that although frogs possess the same general characteristics, many an(prenominal) different species have developed their own unique rules of falsification and escaping predation.
Some species of frog have discovered that one of the trounce forms of defence is simply to hide. Many frogs have developed a great number of different disguises to escape the sight of capableness predators. For example the Mossy frog (Rana septentrionalis- Fig. 2.7) is covered in underage bumps and spines, (Raxworthy, 2007), which along with its brown/green colouration allows it to portmanteau word perfectly into its mossy surroundings. These frogs can be prime in very moist areas which have bountiful areas of mysterious moss such as flooded caves and banks of mountain streams, (Raxworthy, 2007). Several opposite species of frog also use camouflage as a form of defence. The Pacific Tree Frog (Hyla regilla) has developed the energy to variegate its skin colour. They are able to alternate in green and brown patterns in only a matter of minutes.

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Unlike other amphibians and reptiles they do not change colour according to their background colour, instead it is due to temperature and wet levels, yet it still provides them with a very successful method of camouflage, allowing them to be overlooked by potential predators, (Hill 1998).

The Chilean four-eyed frog (Pleurodema thaul) has developed another form of disguise, rather than hiding itself it attempts to caution off predators by pretending it is a much big organism, and therefore perhaps a potential threat to anything deficiency to prey upon it. It achieves this through the aid of a bright duette of spots located on its rump. When the frog is sitting these spots are not visible, however when threatened it impart lower its head and lift up its rump displaying the spots. These almost magical spots resemble a set of ferocious looking eyes, transforming the rump to appear to be a very...If you want to get a full essay, place it on our website: Orderessay



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