High population density increases the proportion of unsuccessful males in both male-male competition and female choice contexts. This prediction assumes that these components of sexual selection opera...

ALT: Crab Walking with Large Yellow Claw

In territorial animals, fights against strangers are often more aggressive than those against neighbours. This is called the ‘dear enemy’ phenomenon a…

The evolutionary change in the mode of locomotion is often a major evolutionary event, triggering diversification. Sideways locomotion is a defining feature of true crabs (Brachyura) and may have cont...

For symbionts of marine invertebrates, migration between hosts for mate-searching entails various ecological difficulties. Aggregation in hosts is a b…