undulating flight in a sentence

Examples

1. They might also be confused with the black-breasted buzzard ( " Hamirostra melanosternon " ), but this species is much smaller, has white patches on the wings, and has a more undulating flight.
2. As I made my way through the weeds, the goldfinches were always the first birds to flush; keeping just ahead of me they moved in undulating flight to the next patch of thistle, calling as they took off.