I have designed an animal that lives on a low-gravity planet. It has bird-like digitigrade legs with raptor-like claws, similar to the image below, except with two wider toes instead of three in the front.
The toes are designed this way so the creature can perch on surfaces, etc. However, I also wanted to make the creature be able to run quickly. I noticed while researching that ostriches and even velociraptors do not have a back toe, implying that they could get in the way of running quickly. Would it make more sense to remove the back claw, or find some way to have it "retract" while running? Would it necessarily have a big influence on running speed/efficiency, or have a big effect on the gait of the creature?