Image from the Biodiversity Heritage Library.
Contributed by Museum of Vertebrate Zoology, University of California, Berkeley.
| www.biodiversitylibrary.org
Transcription
1976 Walter D. Koenig
13
Melanerpes fornicivorus
Plague
Hastings Reservation
(21 May) One was a dwarf, but the other six were all quite
healthy looking and already opaque. Unfortunately there
are not 2 good sets of different-sized eggs, but it
would seem fairly sure that both ♀♀ have
contributed - incredible given that ① the first ♀ is
new ② the 2nd is a 2nd-year bird and ③ there is only
one ♂ in the group. Of interest, however, is that
the 2nd-year bird is not the offspring of either of the
2 adults - potentially an important facet of the
circumstance. In any case, this is the best evidence
to date for ① potential breedability of 2nd-year birds
and ② lack of "pairing" among group members.
Pretty incredible! Especially considering the size of that
limb!
23 May
1115.3 birds atop Plague: 2 ♂♂ (1 unring) and ♀157.
Both ♂♂ flushed to the lone Blue Oak; I don't know
what their story is! (Possibly neither was the Adult ♂ that lives
here).
1120. All 3 group birds meeting each other atop Plague: ♀157,
♀245, ♂ub.
1122. leaving.
25 May
1830. 1-2 birds getting chased and displaced from the 2nd tree by at least
an unringed ♂ and ♀245. One of the intruders had heavy tail
spotting - probably a 2nd-yr bird.
26 May
Heard nestling sounds coming from the nest at 1730.
30 May
1230 ♀245 seen going to feed nestlings. I went up and
checked the nest, discovering only 3 nestlings and one unhatched