Immature male: resembles adult female ... distinct from Anna’s. Costa’s generally plainer on throat and underparts, without dusky throat spotting. See black-chinned hummingbird.

This hardy little bird is a permanent resident along our Pacific Coast, staying through the winter in many areas where no other hummingbirds are present. More vocal than most hummingbirds, males have ...

This is one of the two common nesting hummingbirds in northern California gardens (Anna's is the other). Females and immatures of Allen's Hummingbird are almost impossible to separate from Rufous ...

Male Anna's hummingbirds have an iridescent pink face and typically weigh four grams — just under two pennies. Brian Allen, with the Audubon Society in Manistee, said he was called over to a ...

He determined that the hummingbird is an adult male, weighing 4.02 grams and showing signs of good health with some fat reserves. "He has a little bit of fat on him — that's important," Chartier noted ...