Additional file 5: Movie 4.
Download video file (18.6MB, mp4)
Complete manufacture sequence by an immature crow. (MP4 19000 kb)
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.