Source: BBC Nature
U.S. researchers were surprised to find that female snapping shrimp are more aggressive and more inclined to snap at other shrimp than males.
Snapping shrimp, which have one large claw and one small claw, are named for the snapping noise their large claw makes when they use it to defend their territory or kill prey. Although males have larger snapping claws, researchers found that females snapped at intruders more frequently in a test setting.
During the study, two species of snapping shrimp were collected and placed into tanks, where they were given time to claim burrows. The shrimp were then introduced to same-sex and opposite-sex intruders and the number of times they snapped at the intruder was counted. Females were found to snap more times overall and were particularly hostile toward other females. Males reacted with equal amounts of aggression toward both males and females.
The question of why female snapping shrimp are more aggressive remains unanswered, especially in light of the fact that males in most species are the more hostile sex.
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