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.
Phylogenetic signal contained in three vocal characters for three clades of herons and the glossy ibis
| Species | No. syllables | Syllabic structure | Fundamental frequency |
|---|---|---|---|
| Outgroup (glossy ibis) | Series | Harmonic | Low |
| Tiger-heron, boat-billed heron | Series | Harmonic | Low |
| Bitterns | 1, 2, or 5 | Whistle | Intermediate |
| Day-herons, night-herons | 1, 2, or 3 | Harmonic | High |
