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Lions sleep on the ground.
'Sleep' is an abstract noun since it refers to a condition or state.
Fish sleep on the ground.
They live and sleep in the ground.
pretty easy yup they sleep
Yes they do.
on the ground
The Ground
on the ground
The ground or straw
it depends on the animal horses sleep against a fence or something and things like monkeys or birds sleep in trees some animals suck as the wolf or dog will sleep on ground where as the weasle may sleep under ground
Monkeys sleep in the tree tops, as it would be too dangerous to sleep on the ground.