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ART OF VISUAL PRESENTATION
Courtesy of Figure 4.
the National Geographic Magazine.
WHAT IT TAKES TO RAISE A CROW
The nestling crow requires about 10 ounces of food per day, or about 13V& pounds for its nestling life of three weeks. At the end of that time it will weigh about a pound. During this period it will have eaten two and a quarter times its own weight of May beetles. The grasshoppers it has eaten would, if combined, form a mammoth insect about twice the size of the bird. Wild birds and poultry would each form a mass about a fifth of the crow's weight and corn about one and onehalf times its mass. Here are pictured a fully fledged young crow and its principal food items. These include small mammals, spiders, caterpillars, May beetles, poultry, wild birds, miscellaneous beetles, carrion, corn, amphibians, crustaceans, and grasshoppers. These are all drawn to a scale that approximately represents the aggregate mass of the different items consumed during the nestling life, compared with the bird that ate them.
From "The Crow, Bird Citizen of Every Land," by E. Survey.
R. Kalmbach, Ass't Biologist, U. S. Biological
ferent items are now known to furnish sustenance to the crow.
(a) Pictures Facilitate the Condensation of Facts : — To present the wealth of tabulated data and descriptive literature of modern field ornithologists on the food habits of even a single species
of bird like the crow would indeed require pages of print and hours of study. But in Figure 4 we have a "pictorial condensation" of all the general results, of all the salient points stripped of minor and overly technical details, and requiring no more than a
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