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ZEISS DTI thermal imaging cameras. For more discoveries at night, and during the day.
White-throated Sparrow
This one dropped into our yard for a couple of days, but seems to have moved on. They are an uncommon winter visitor and migrant in California. They are famous for negative assortative mating between the two color morphs. White-striped morphs prefer to mate with tan-striped morphs and vice versa. However, this species does not cleanly separate into tan and white striped morphs in the winter when there is more of a continuum of head stripe color variation, possibly to facilitate flock cohesiveness (Atkinson & Ralph 1980). This individual appears intermediate but may lose the slight tan color by Spring.

Reference:
Atkinson, C.T. & Ralph, C.J. (1980). Acquisition of plumage polymorphism in White-throated Sparrows. The Auk. 97: 245-252.
Location
San Pedro Creek, Pacifica, California, USA.
Date taken
16 October 2021.
Scientific name
Zonotrichia albicollis
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Reactions: delia todd
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Attractive sparrows these I think.

A right grand picture you've taken of him Joe - thanks my friend.
 

Media information

Category
North America
Added by
jmorlan
Date added
View count
260
Comment count
3

Image metadata

Device
Canon Canon PowerShot SX60 HS
Aperture
ƒ/6.5
Focal length
247.0 mm
Exposure time
1/60 second(s)
ISO
800
Flash
Off, did not fire
Filename
White-throatedSparrowIMG_8619.jpg
File size
447.9 KB
Date taken
Sat, 16 October 2021 7:56 AM
Dimensions
1024px x 778px

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