Image #BRR-2: Measuring the dbh [diameter at breast height] of a Prioria copaifera tree (Fabaceae) at the Barro Colorado tropical forest site, Panama. (Zenith Batista and Eduardo Sierra, field supervisors and botanists, are taking the measurements, while Robin Foster [right] is looking through binoculars at the leaves to identify the species. The tree in the background is a Ceiba pentandra (Bombacaceae), one of the largest individuals in the experimental plot. Photograph taken 1990).