Image from the Biodiversity Heritage Library.
Contributed by Museum of Vertebrate Zoology, University of California, Berkeley.
| www.biodiversitylibrary.org
Transcription
Cogswell
1950
Anas platyrhynchos
2
July 16 L. Van Norden, 6770 ft., Blazer Co., Calif - 1? flew up from SE end (near conifer forest) - the shallower end
July 19 3 ??-plumaged birds swam close together along this same shore.
July 26 Little Washoe L., 5025ft, Washoe Co., Nev. - about 200 adults (mostly in 4? plumage?) on lake ? marshy arm at S. end. The latter held many downy young of various sizes (none well feathered yet), and 4? attached to them put on extensive wing flapping displays.
Aug.1 L. Van Norden [see above] - 1? accompanied by 9 three-quarters sized young which could not get into the air when they tried to fly. The early date at which this brood must have hatched (cf. much later ones at lower elev. on July 26) may be the result of early arrival of breeding pairs here (see June 20)
Aug.3+5 Apparently the same 4?, now with only 8 young. They feed regularly along the N shore where, sedge & other herb-covered flats are being exposed or brought into shallows by gradual draining of the lake.
Aug.6 N end Washoe L., 5010 ft., Washoe Co., Nev. - about 30 shore in several small groups by drying marshes or on open lake,
Aug.7 Boca Res., 5560 ft., Nevada Co., Calif - 9 in 4? plumage swimming lined up in a close group (= family of grown young?) on E side.
Aug.9 Little Washoe L. [see above] - 400 est., all in dull plumage.
Aug.13,15 Lake Van Norden [see above] - some(?) flock of 9 + 2 others.