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.
Relative egg mass (corrected for adult mass) is greater in species with longer embryonic periods (d) among 64 passerine species in tropical Venezuela, subtropical Argentina, and north temperate Arizona. Open symbols reflect cavity-nesting species and show an interacting effect where their larger clutches are associated with relatively smaller eggs (Fig. 2).
