Your pet may decide to be playful or funny and find a hiding place that is not so easy for you to get to. There are many reasons why this may have happened. Your pet may have been startled by another animal, a loud noise or just wanted to explore.
Try to coax them out with a piece of fruit or vegetable that is safe for them to eat or a treat. Try not to hover around the area, it might frighten them and make them nervous. Stay calm, this is not unusual behaviour, it happens!