BTO have produced a video to help you identify Hirundines and Swifts.
Click on the play button to watch the video
Source: Identifying Hirundines and Swift | BTO – British Trust for Ornithology
BTO have produced a video to help you identify Hirundines and Swifts.
Click on the play button to watch the video
Source: Identifying Hirundines and Swift | BTO – British Trust for Ornithology