Original: The enlarged second toe bore an unusually large , curved sickle-shaped claw ( held off the ground or ` retracted ' when walking ) , which is thought to have been used in capturing prey and climbing trees ( see '' Claw function '' below ) .
Simplified: The enlarged second toe bore an unusually large , curved sickle-shaped claw . It is thought to have been used in capturing prey and , in the smaller species , climbing trees .