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Download PDF by Adolf Portmann: Animal Camouflage

By Adolf Portmann

The rugged define of a mountain height seems like a human face; the markings on a moth exhibit a cranium and crossbones. Mere coincidences we are saying, and push 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 enormous half within the animal's survival. This brings us instantly to the crux of our challenge: the functionality of outward appearances.

We have all obvious bugs which are the colour of bark and brooding pheasant hens whose feathers look like the fleeting shadows in their nesting flooring. We could have chanced upon a moth whose in basic 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 in an effort to live on. sleek armies use camouflage to guard their squaddies, weapons, ships, and army installations; the result's evidence optimistic of the protective worth of such suggestions. The reader aren't stunned then, if we inform him that our topic has performed a favourite half in all discussions in regards to the starting place 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 idea.

This isn't to assert that the professionals all agree. What a few decide to clarify as camouflage, others describe in altogether various phrases. a bunch of experimenters has got down to end up a number of the theories, yet constantly with ideal medical detachment. the matter of mimicry, particularly, has turn into a veritable no man's land of organic battle.

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

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Publisher: University of Michigan Press. Place of Publication: Ann Arbor, MI. Publication Year: 1959. Page Number: 42. 40 title plays the part of the veins, and the leaf resemblance is increased further by stalklike projections on the hindwings. The Asiatic dead-leaf butterfly (Kallima) is the classic example of this type of leaf resemblance ( Fig. 47 ). FIG. 47 The dead-leaf butterfly (Kallima). Top: the conspicuous upper surface; bottom left: the real direction of the veins; and bottom right: the superimposed pattern.

Publisher: University of Michigan Press. Place of Publication: Ann Arbor, MI. Publication Year: 1959. Page Number: 37. 35 title FIG. 42. A sponge crab (Dromia vulgaris) holding its sponge mask by a specially adapted pair of legs. ) mask their unprotected bodies by a cover that is part glandular secretion and part foreign body. Good examples are the family of bombycid moths (Psychidae), and the aquatic caddis fly. Foreign substances may be allowed to stick to the skin or else the larvae may hide beneath their own excrement.

Others, for instance hawk-moths, simply hide their conspicuous hindwings ( Fig. 60 ). In certain bugs, such as the Brazilian pentatomid bug (Phloea), the seemingly squashed body segments produce a most remarkable disguise ( Fig. 61 ). -51Questia 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: 51. 49 title FIG. 60.

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Animal Camouflage by Adolf Portmann

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