Hi Caroline, I think it may be a Black-tailed Skimmer dragonfly but wait for other opinions.
Black Tailed Skimmer.
Don't worry whether its a bird or not, we share among the forum all sorts, insects, animals and plants. they're all part of nature, without one, the others wouldn't survive. Please feel free to share what you see with us, we'll be only to happy to share with you.