. Uccelli della California; un'introduzione a più di trecento uccelli comuni dello stato e delle isole adiacenti, con un elenco supplementare di migranti rari, visitatori accidentali, e sottospecie ipotetiche. Non sembrava esserci alcuna definizione tra la durata del periodo di alimentazione regurgio-facoltativa e la durata del tempo richiesto per il pieno sviluppo del nascente. I giovani vul-tures sono stati nutriti in questo modo iov dieci giorni, e sono rimasti al nido nove settimane. Young robins ha ricevuto theirfood da questo processo tre, occasionalmente quattro, giorni, e di solito ha preso il volo il quindicesimo giorno

• Collaboratore: Reading Room 2020 / Alamy Foto Stock
• ID dell’immagine: 2CNEW69
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. Birds of California; an introduction to more than three hundred common birds of the state and adjacent islands, with a supplementary list of rare migrants, accidental visitants, and hypothetical subspecies . ition. There seemed to be no definiterelation between the duration of the period of regurgi-tative feeding and the length of time required forthe full development of the fledgeling. Young vul-tures were fed in this way iov ten days, and stayed inthe nest nine weeks. Young robins received theirfood by this process three, occasionally four, days, and usually took flight on the fifteenth day. Hum-ming-birds, swallows, and a few others are fed byregurgitation so long as they remain in the nest.Goldfinches, waxwings, and others are nourished inthis way, with an occasional meal of raw food, untilthey are ready to fly. The list is a long one, and asmost if not all of these instances are mentioned intheir individual biographies, given in this volume, they need not be cited here. Scientists have longknown that pigeons, doves, and humming-birds feedtheir young in this manner, and the discovery thatmost species do likewise need cause no surprise. Irene Grosvenor Wheelock. Chicago, January 1, 1904.. IDENTIFICATION Thj: accompanying chart of a bird will explain the termsused in the descriptions. Upper parts refers to theentire upper surface of the body of the bird from the billto the tail. In the same manner, Under parts refersto the under surface. In identifying, decide first into which class the bird youare observing is likely to belong, — that is, whether landor water birds. If water, whether it is found on the opensea, or near shore, or in bayous or marshes, and whetherit is a swimmer or a wader, and then look for it in the listwhere you think it may belong. Always ascertain as nearas you can the birds lengthy and remember, in judginglength, that a bird usually looks smaller than he actuallymeasures. If the bird is among the land birds, and isneither a game bird nor a

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• bookcentury1900
• bookdecade1900
• booksubjectbirds
• bookyear1904