Image from the Biodiversity Heritage Library.
Contributed by Museum of Vertebrate Zoology, University of California, Berkeley.
| www.biodiversitylibrary.org
Transcription
Okanogan Logging, Oct. 12
2:30 p.m. - Brooks says Pigeon Owls show erectile "horns", on provocation; he has a skin so adjusted. Look for this in live birds!
In New Mexico all Swainson Hawks are light, white-bellied; the melanic birds from the north come south in Sept., to be called, locally, "eagle hawks". Brooks this type is what Lee Chambers called "Harris Hawk", recorded as in flocks, from Imperial Valley. Check him! Harris Hawks don't go in flocks!
In Swainson Hawks, which nest here commonly, always 2 eggs, 2 young; but one young eats the other, so only one grows to maturity, probably the one that hatched first!
Goshawks: Brooks' material shows definitely that "striatulus" characters (bird-bearing) are second-year birds; always some juvenile feathers carry over and can be found. The finely, narrowly, marked adults are striicapillus. Therefore no subspecies.
Brooks and I together looked over Teal, and both decided we could find no good character in ?♀ or young ♂♂ (until molt begins in the latter), as between Blue-winged and Cinnamon.