Black-chinned Hummingbird vs Costa's Hummingbird

The Black-chinned Hummingbird and Costa's Hummingbird can be distinguished by their throat coloration: the Black-chinned has a black throat with a thin iridescent purple band, while Costa's has a more extensive iridescent purple throat and crown. Both species are small and similar in size, but their throat patterns are the most reliable field marks.

Focus on the throat coloration: Black-chinned has a black throat with a thin purple band, while Costa's has a more extensive iridescent purple throat and crown. These differences are most apparent in good lighting conditions.

Black-chinned Hummingbirds have a black throat with a thin iridescent purple band, whereas Costa's Hummingbirds feature a more extensive iridescent purple throat and crown.