Download Animal Camouflage by Adolf Portmann PDF

By Adolf Portmann

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

We have all visible bugs which are the colour of bark and brooding pheasant hens whose feathers appear like the fleeting shadows in their nesting flooring. We could have chanced upon a moth whose simply safety is the coloring that makes it resemble a wasp. each one of those animals pretends to be anything it's not, and it does this with a purpose to continue to exist. sleek armies use camouflage to guard their squaddies, weapons, ships, and army installations; the result's evidence optimistic of the shielding worth of such strategies. The reader aren't stunned then, if we inform him that our topic has performed a famous half in all discussions concerning the foundation and the evolution of dwelling organisms. Charles Darwin was once one of many first to emphasize the significance of camouflage, and because his day the topic has shaped one of many strands of organic concept.

This isn't really 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 end up a number of the theories, yet continually with ideal clinical detachment. the matter of mimicry, particularly, 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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Extra info for Animal Camouflage

Sample text

65 ). The animal which carries this type of resemblance to its extremes is the Malagasy weevil (Lithinus nigrocristatus) of Madagascar ( Fig. 66 ). The buff-tip moth (Phalera bucephala) combines bark and lichen patterns with a branch-stump effect that is extremely deceptive ( Fig. -56Questia 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.

FIG. 37. Two masked crabs: left, Hyas, camouflaged with algae; right, Pisa, covered with sponges and corals. -34Questia 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: 34. 32 title FIG. 38. Section through the horny shell of a masked crab showing bristles for holding material. ) has been able to show that the turning of these animals toward the light is not due to visual responses but to responses of the insect's entire surface.

The larva of an African mantid (Pseudocreo- botra wahlbergi) resembling the early form shown in Figure 74b. (Photograph: H. R. ) -64Questia 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: 64. 62 title FIG. 76. African butterflies (Ityraea gregoryi) giving the effect of a complete flowering plant. ) Hetaera. These butterflies have glasslike front wings and pink spots on the hind wings.

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