Even if a rare Rufous Hummingbird has some green on the back, any rufous feathers on the back make it a Rufous according to some experts. The only thing I would add is 3 tabs to separate the main sections.You can add section tabs yourself with removable plastic tabs from an office supply store. While Allen's Hummingbird are resident year round in Los Angeles, Rufous are just passing migrants whose breeding range barely dips into the very far north of the state. The bird spent the entire winter with us and left as an adult male, and he returned 3 days ago. I therefore set myself the task of photographing a few of these green backed birds in order to uncover their identities.Though the outer two tail feathers (retrices four and five) on adult male Rufous Hummingbirds are wider than adult male Allen’s Hummingbirds, the most obvious identifier is retrix two (the tail feather to the right or left of the two central tail feathers) which has a distinct notch on its inner edge, creating a distinctly shaped feather different to the smoothly tapered retrix two (R2) of an Allen’s Hummingbird.Allen’s vs Rufous Hummingbird Tail Pattern – Luke TillerTo my surprise when I started taking spread tail photos of these green backed birds I discovered that many of them were in fact Rufous Hummingbirds. She has a broad black band on the tail tipped with white.
Following that is a blow up of the above feeder photo.
However, the male Allen’s hummingbird is greener on its head and back with more orange on its flanks than the male rufous hummingbird. 0000000927 00000 n
Toward the end of Ken’s life, one of the networks came to his Pleasant Hill, Oregon home for an interview. The common theory goes that most female and juvenile birds are best left unidentified to species during the aforementioned window, but that if you are looking at adult males the orange backed birds are probably Rufous and the green backed ones probably Allen’s.Though of course I’ve known that around ten percent of adult male Rufous Hummingbirds can be green backed I think I’ve somewhat lazily presumed that one in ten is a low enough percentage that you’re probably fairly safe assuming any green backed adult male Rufous/Allen’s here in Altadena is an Allen’s even during this migration period.This spring however (2020) was an excellent one for finding Rufous Hummingbirds at one’s feeders. This bird is visiting my yard in Little Rock,AR. Beyond those times it’s probably relatively safe to assume you are looking at an Allen’s Hummingbird unless you have direct evidence to the contrary.I think it’s safe to say that if you asked most local birders they’d know that it’s very difficult to identify Rufous and Allen’s Hummingbirds in the field unless you are looking at adult male birds. This “new” wintering area now stretches across much of the eastern U.S., though Rufous wintering in northern and inland areas are more vulnerable to extreme weather events like Winter Storm Stella that’s hammering the Northeast right now. Not to be stubborn, but to make sure I understand this correctly, if I observe a Selasphorus-type hummingbird with an all-orange back, then this still essentially diagnostic of adult male Rufous? Length: 3.5 in (9 cm); Wingspan: 4.3 in (11 cm); Weight: 0.1-0.1 oz (2-4 g) While Allen’s Hummingbird are resident year round in Los Angeles, Rufous are just passing migrants whose breeding range barely dips into the very far north of the state. Females/immatures are very difficult to separate from females/immatures Rufous Hummingbird. In spite of its small size, the male Allen's are considered to be the "bully on the block" and ferociously defend their territories. I was told this by a local birder on my first visit to southeastern Arizona in 1978, and on her authority I put Allen’s Hummingbird on my life list based on the little orange and green female-plumaged birds swarming around her feeders. Some literature I read said about the only way to tell the difference between female and immature ALHU and RUHU is the shape of tail feathers. Two studies of rufous or Anna's hummingbirds in a wind tunnel used particle image velocimetry techniques to investigate the …
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