Figure 5.
Relationship between order of song development and song similarity; values for birds that developed their song in order 3, 4, and 5 were lumped together (P < 0.05 for comparisons between order 1 and 2 and between 1 and 3–5).
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.