Acorn woodpecker species accounts, v4442
Page 83
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