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In the earthworm Lumbricus terrestris L., mating occurs on the soil surface, but partners remain anchored in their burrow and mating is preceded by repeated mutual burrow visits between neighbors. This study focuses on body size as one possible trait that earthworms may assess during these burrow visits. Size-related mate choice is predicted to result in size-assortative mating, which we found in one field sample (n ϭ 90 pairs), but not in a second (n ϭ 102). We discovered that when matesdoi:10.1093/beheco/12.5.612 fatcat:qul75fetrve2vbdold7ovagu2y