so i just put my two rabbits in their new hutch, the run and hutch are joined by a ramp but they have both been in their for two days now and still havnt used the ramp, how do i encourage them to use it? i tried putting some lettuce leaves on it but that didnt work and i also tried putting them into the run to see if the would go up the ramp but they didnt. so iv run out of ideas now.