February 3, 2018

Download PDF by Adolf Portmann: Animal Camouflage

By Adolf Portmann

The rugged define of a mountain height feels like a human face; the markings on a moth convey a cranium and crossbones. Mere coincidences we are saying, and brush aside the problem as one other freak of nature. but if we stumble upon an animal that appears like a leaf or a spray, we start to ask yourself. This likeness has to be greater than chance--it needs to play an immense half within the animal's survival. This brings us immediately to the crux of our challenge: the functionality of outward appearances.

We have all noticeable bugs which are the colour of bark and brooding pheasant hens whose feathers look like the fleeting shadows in their nesting flooring. We can have chanced upon a moth whose in simple terms defense is the coloring that makes it resemble a wasp. each one of those animals pretends to be whatever it isn't, and it does this so one can live on. sleek armies use camouflage to guard their squaddies, weapons, ships, and armed forces installations; the result's facts optimistic of the shielding worth of such recommendations. The reader are usually not shocked then, if we inform him that our topic has performed a in demand half in all discussions concerning the foundation and the evolution of residing organisms. Charles Darwin used to be one of many first to emphasize the significance of camouflage, and because his day the topic has shaped one of many strands of organic thought.

This isn't to assert that the gurus all agree. What a few decide to clarify as camouflage, others describe in altogether diverse phrases. a bunch of experimenters has got down to turn out some of the theories, yet regularly with excellent clinical detachment. the matter of mimicry, specifically, has turn into a veritable no man's land of organic battle.

These are issues our publication will discover. Casting our look over an unlimited canvas, we will attempt to hint the
meaning of a few of the colourful brush strokes that went into its portray.

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Animal Camouflage by Adolf Portmann PDF

The rugged define of a mountain height appears like a human face; the markings on a moth express a cranium and crossbones. Mere coincidences we are saying, and brush aside the problem as one other freak of nature. but if we encounter an animal that appears like a leaf or a spray, we start to ask yourself. This likeness has to be greater than chance--it needs to play a big half within the animal's survival.

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41Questia Media America, Inc. com Publication Information: Book Title: Animal Camouflage. Contributors: Adolf Portmann - author. Publisher: University of Michigan Press. Place of Publication: Ann Arbor, MI. Publication Year: 1959. Page Number: 41. 39 title FIG. 46 Wing veins of leaf insects. (a) Of a Carboniferous insect (Palaeodictyoptera), (b) of a tropical grasshopper (Mimetica), (c) of a grasshopper (Cyrtophyllites) of the Jurassic period, (d) of another grasshopper (Mastiphaga). " Co: costal vein; Cu: cubital margin; M: median; R: radial vein and branches; Sc: subcostal vein.

H. Süffert discovered the existence of double -32Questia Media America, Inc. com Publication Information: Book Title: Animal Camouflage. Contributors: Adolf Portmann - author. Publisher: University of Michigan Press. Place of Publication: Ann Arbor, MI. Publication Year: 1959. Page Number: 32. 30 title counter-shading in caterpillars of the clouded yellow butterfly (Colias edusa), in which two regions of the body--separated by light contrast--are counter-shaded independently ( Fig. 32 ). This double counter-shading only has a contour-dissolving effect when the light comes from the top and when it goes hand in hand with an appropriate attitude.

Place of Publication: Ann Arbor, MI. Publication Year: 1959. Page Number: 57. 55 title moth caterpillar moves along with the looping gait which has earned it the name of "measuring worm" or "looper" ( Fig. 29 ). Here the animal is concealed not so much by its appearance as by its concealing attitude. A few of the many possible attitudes of geometrid moth larvae are illustrated in Figure 69. Naturally, concealing patterns go a long way to increase the effectiveness of such behavior. FIG. 67. The buff-tip moth (Phalera bucephala) combining bark and lichen pattern with branch-stump effect.

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Animal Camouflage by Adolf Portmann


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