By Niko Tinbergen and The Editors of LIFE
Glossy scholars of animal habit, between whom Dr. Tinbergen is a pacesetter, have many times proven that relatedness of other animal species is simply as absolutely expressed by means of evaluating their habit styles as through evaluating their physique forms.
Being comparative, habit examine isn't a box for the slender professional. Dr. Tinbergen's distinctive paintings comprises research of the homing of wasps, the courtship of butterflies and the nesting habit of sea birds. His extensive adventure and deep insights are the following mixed in a desirable quantity which constitutes not just a problem yet an encouragement to each reader. an individual, Dr. Tinbergen turns out to assert, with a pointy eye and ear, a degree of persistence and a fit skepticism approximately leaping to conclusions, can profitably learn animals and should conceivably make observations of lasting price to technological know-how. [From the creation]
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Extra resources for Animal Behavior
Take man and — ever, have eye reacts to light waves only of a cer- man fails to respond to the shorter and longer waves of the optical spectrum. so if bee. Because The bee is not — hampered at least as far as the shorter waves go and can actually see ultraviolet. Thus, to the bee a flower let ( left) may display a pattern etched in ultravio- that impels the bee toward the nectar. But should the flower be red, the bee would see black, simply because its it as eyes do not register the longer light waves.
Light entering the eye yellow arrows) does not activate the outer layers, but does actuate the re- bipolar cells layer i of ( ceptors, which initiate signals that travel in the direction of the red THE CATS RETINA, oddly enough, has only two kinds of ganglion cells, opposed to four kinds for the although its owner is a more highly developed vertebrate. A way as frog, to characterize scribe it it would be as less orderly glion cells display to de- — the gan- an almost hap- hazard connection to the bipolar Even so, the nerve impulses cells.
Million optic nerve fibers. bled in many characterized by a remarkable fineness each eye on which the image and film (the receptors of the Although far from perfect optically, elastic lens to focus the light, THE OCTOPUS —the compound eye — consists EYE. the most advanced visual apparatus of any found among the invertebrates, has evolved independent- THE INSECT EYE ly of the vertebrate eye, yet, with a few obvious diflTerences such as a rectangular pupil and two protective coats instead of one, it shares many of its basic features.