vintage Christmas tree ornaments, clip on hard plastic birds w/ tinsel tails

Vintage hard plastic birds with tinsel tails, to clip on a Christmas tree so they perch on top of the branches. So cute!

This is a set of four birds, 5 1/2" long end to end. I couldn't find any markings on these - maybe Hong Kong? Each one is a different color, red, blue, yellow, green. All are in very good condition.