We determined the relationship between incubation success and physical characteristics of Podocnemis expansa nests on 4 sand beaches of the Araguaia River in the southern Amazon basin, Brazil. Sand samples measuring grain size, humidity, and density were collected during the first 7 days after egg laying. The choice of nest site seems to be more relevant for the reproductive success of a P. expansa than the female's capacity to build a nest.
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Vol. 6 • No. 2