I would use more modern sources before the 1978 article, in part because more is known now. The problem here is that we have two competing truths:
a. hummingbirds can learn songs
b. hybrids can sing the song of a parent
It seems to me that these things more or less cancel out and we are left with plumage and structure.
Attending Christmas Bird Counts with good weather forecasts.
> On Oct 30, 2019, at 8:40 AM, <rriparia...> wrote:
> Looking further into this bird,
> I found an article:
> Wells at. al. , 1978, Auk 95
> The abstract discusses hybrids between Costa's and Anna's with males appearing most like Costa's and giving a song typical of Anna's.
> I did not have access to and did not read the article.
> Maybe others have already concluded that this bird is likely a hybrid, so I'm a little slow here. I thought it was interesting that observations of this bird are supported in this cited literature.
> Sent from my Verizon LG Smartphone