Although the dominant tree species shown here is California Bay Laurel, there are a few overshadowed oaks in the middle of all that. Nuttal's is a small woodpecker, with a black-and-white, barred back, confined primarily to the oak woodlands of California. Interestingly, although Nuttall's Woodpeckers are nearly confined to oak woodlands, they do not eat acorns, instead going for insects and arthropods, and some fruit.
Although I couldn't get a clear photo through the foliage, I was able to glimpse the distinctive features of the Nuttall's, at least enough for identification. Nuttall’s color pattern is distinct from other woodpecker species in this area, easily distinguishable at a glance due to the barring on the back and the single red patch. The other two species here from the same genus, Picoides, are the hairy woodpecker and the downy woodpecker. Although they both also have the single red patch on the rear crown, they also have a broad white patch on their back instead of the barring of the Nuttall's.
This watershed supports 7 species of woodpeckers, from 5 different genus’s of the family Picidae. Additional woodpecker species seen locally include: acorn woodpecker, Lewis’s woodpecker, red-shafted northern flicker, Red-breasted sapsucker, and a personal favorite - the pileated woodpecker. There is a pair of pileated woodpeckers which frequent the local area, and I'll have a post on them in the future.
Cornell Lab of Ornithology - The Birds of North America Online (A. Poole, Ed.). Ithaca: Cornell Lab of Ornithology; Retrieved from the Birds of North America Online:http://bna.birds.cornell.edu/bna/species/
don't you just love nature sounds? I love that rhythmic woodpecker beating sound!
ReplyDeleteBy the way, somewhat random question but your red crown comment made me think since so many woodpecker species have a red crown do we know its significance?
That is a really great question Sebastian. I'm not an expert in that area for sure, and I'll ask others with more experience in the area to chime in, but here is my best guess:
ReplyDeleteThere are a few different level to "significance". Why there is a patch of color in that location in the first place, why it is that color, and why so many woodpeckers have that color in that spot. I imagine that the color patch is used as a social signal among the birds, especially because it is displayed on the back of the head (which is visible when the bird is foraging or doing territorial drumming). The red color may just be something that happens to be very effective communication or sexual selection for this family (they are all Picidae). However, many females have similar coloration to the males, and in some species, both will do territorial displays to intruders (there is a great video clip of this with David Attenborough). There are some woodpeckers common elsewhere with other colors like yellow or olive green instead of the red, but those are similar colors biologically (from what I understand). Many woodpecker species may have the similar patch because they are closely related evolutionarily, and the common ancestor used a red head patch as a form of communication/benefited from it, and we are seeing similarities from its origin as the it speciates.
Here are some additional behavioral ecology articles on the effects of messing with colors ("color manipulation") on woodpeckers and other birds:
http://www.jstor.org/pss/4087446
http://www.springerlink.com/content/yg7260142011429w/
http://books.google.com/books?hl=en&lr=&id=PV78s7jq8tMC&oi=fnd&pg=PA51&dq=woodpecker+color+social+communication&ots=4YqtgVHIhw&sig=BeXuO7M07-JUjx0-1nrrWHK0qws#v=onepage&q&f=false
Does anyone else have additional thoughts/knowledge to address Sebastian's question?
Hey Aviva,
ReplyDeletethanks for the great articles and the video. Learned a lot from your post there, which I very much appreciate.
Just in case anyone else is interested, Aviva sent me this url to the Attenborough video later on:
http://www.youtube.com/watch?v=MNmh5w6cj78.
Thanks again for the great info!
Seabass