Image from the Biodiversity Heritage Library.
Contributed by Museum of Vertebrate Zoology, University of California, Berkeley.
| www.biodiversitylibrary.org
Transcription
California Condor
April 9 Sespe Creek Condor Refuge, Ventura Co., California -
Sunny, warm, breeze from south, hazy clouds. Observations
from Dough Flat looking at high cliffs containing many
holes. Observations beginning 2:45PM. One bird (adult) flew
across face of cliff & out of sight. Vultures & Red-tailed Hawks
frequently circle area. An adult condor circles & lands on top of cliff.
(2-3 minutes)
Shortly a second adult lands beside the first bird.
One bird mounted the second within 2 minutes after the two
birds were together. The upper adult spread & flapped it wings
slowly. Copulation lasted at least a minute. After
copulation one adult appeared to lower & then raise its
head in front of the other. This was done slowly
and several times at 1/2 minute intervals. They
were facing each other during this time and
this activity was followed by a period when the
(several minutes)
bills of the two birds were placed together
but resolution was such that I could not
tell exactly what was happening at this point.
Birds remained on the ledge for more than a half hour
after this, sitting side by side & occasionally walking
a few feet. We left after 4 P.M. with the
birds still sitting on the ledge. Fred Sibly (US Fish &
Wildlife)
indicated that they probably will fly down into a hole
in the cliff before dark.
Wings are held very constant in flight &
nearly outstretched straight -, in contrast to
vulture dihedral .