WHAT BIRD IS THAT?

'Map' of a Bird (Bluebird not quite life size).
    The student should learn to name the parts of a bird's plumage in order that he may write, as well as understand, descriptions of a bird's color and markings.

WHAT BIRD IS THAT?

A POCKET MUSEUM
OF THE LAND BIRDS OF
THE EASTERN UNITED STATES
ARRANGED ACCORDING TO SEASON

BY

FRANK M. CHAPMAN

INTRODUCTION

As Curator of the Department of Birds of the American Museum of Natural History I have had exceptional facilities for the arrangement of collections designed to give students a comprehensive view of local bird-life without confusing them with unnecessary details.

Among other aids to this end a collection of 'Birds Found within 50 Miles of New York' has been placed in a special hall and so grouped that the visitor who wishes to identify some bird seen within these limits may do so with the least possible difficulty. In addition to the 'General Systematic Collection,' containing specimens of the 350-odd species of birds which have been recorded from the New York City region, there is also a 'Seasonal Collection.' This Seasonal Collection contains only the birds of the month. Its base is the 'Permanent Resident Birds,' or those which, like the Crow, are with us throughout the year. To these, the migratory species are added or subtracted, as they come or go. The collection of migratory species is therefore revised the first of each month. Birds which are due to arrive during the month are added, those which have left us are withdrawn. The Seasonal Collection thus gives us, at a glance, a picture of the bird-life of the month and correspondingly limits the field of our inquiry when we go to it to learn the name of some strange bird recently observed. In January, therefore, we have not to consider the birds of June, nor need we be concerned with winter birds in summer. The season of occurrence thus gives us an important clue to a bird's identity.

For somewhat more than a quarter of a century this small collection has achieved its object so effectively that I have attempted to embody the idea it demonstrates in a series of drawings which have been admirably executed by Mr. Edmund Sawyer. As foundation plates or 'collections,' we have first two 'cases' of the winter land birds of the Northeastern States, or from about Maryland northward, containing the Permanent Residents, which form part of the bird-life of every month of the year, and the Winter Visitants, or those birds which come from the North in the fall to remain with us until the following spring.

Cases 3 and 4 contain the Permanent Resident and Winter Visitant land birds of the Southern States. Whether the student is in the North or in the South he has, therefore, a 'collection' of the land birds which he may expect to find during the winter months.

Cases 5 to 8 contain the migrants arranged according to the order of their arrival from the South in the vicinity of New York City. Since it is not practicable to have cases containing collections of migrants for other latitudes, data are given showing what changes in dates should be made to adapt the schedule presented to other localities, including Washington, D.C., Ossining, N.Y., Cambridge, Mass., northern Ohio, Glen Ellyn, near Chicago, and southeastern Minnesota. The records for these localities are quoted from the author's 'Handbook of Birds of Eastern North America' to which they were contributed respectively by Dr. C.W. Richmond, Dr. A.K. Fisher, William Brewster, Lynds Jones, B.T. Gault, and Dr. Thos. S. Roberts.

With these facts, the cases in a large measure tell their own story, just as does our Museum Seasonal Collection; but further to assist the student I have added what may be termed a 'label' for each of the 'specimens' they contain. These labels include comments on each bird's distinctive characters, a statement of its nesting and winter range, the notes on its status at various localities, to which I have just referred, and brief remarks on its habits.

It is the specimens, however, not the labels, which warrant the publication of this little volume, for I hope that, like their prototypes in the American Museum, they will be a means of acquainting us with "the most eloquent expressions of Nature's beauty, joy and freedom," and thereby add to our lives a resource of incalculable value.

While the birds in the cases are small, they are drawn and reproduced with such accuracy that no essential detail of color or form is lost. Above all, they have the rare merit of being all drawn to nearly the same scale. One will soon learn therefore to measure the proportions of unknown birds by comparison with those with which one is familiar, and since relative size is the most obvious character in naming birds in nature, this is a feature of the first importance.

The student is strongly urged first, to become thoroughly familiar with the 'map' of a bird given in the frontispiece: second, to use an opera- or field-glass when observing birds: third, to write descriptions of unknown birds while they are in view stating their length, shape, and