Abstract
The weights of European and Africanized worker honeybees in swarms were determined. European worker were significantly heavier. Within each population, mean weights of workers from different swarms varied greatly, mostly because of differences in the mean weights of honey sac contents. As the weights of worker differed so much between swarms, it is recommended that an estimate of a swarm size should be based on the mean weight of workers sampled from that swarm.

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