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Contributed by Museum of Vertebrate Zoology, University of California, Berkeley.
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Transcription
Mallard
37.
Mayhew
1952
May 16 Gray Lodge Refuge, Sutter Butte Co., Calif.
Nest 23 - 8 eggs; some down, but not much.
Nest located in clover at edge of road; cover
quite dense + about 30" high. The eggs
are laid on the bare ground.
R. H. - 33%
Temp. - 32°C.
Nest 8 - 9 eggs; fairly large amount of
down. Nest in clover about 24 inches high; +
about 8 feet from a pond.
R. H. - 29%
Temp. - 33°C.
A reading on the ground in the clover was:
R. H. - 30%
Temp. - 27°C.
Air temp., taken within cab of pick-up
with both doors open, was 33°C., air rel.
humidity - 22%.
Nest 18 (Mallard nest) - 14 eggs; lots of
down, but little cover around the nest.
Readings were taken within 30 seconds
after & flushed from nest.
R. H. - 20%
Temp. - 32°C.
These readings were taken between 11 A.M. and
12:30 P.M. The day was dry + clear with
no wind blowing.
May 23 More readings were taken of duck nest
today. The day was warm + clear with
no wind blowing. The readings were