Shapeshifting
In the Ramayana Hanuman changes shape several times. For example, while he searches for the kidnapped Sita in Ravana's palaces on Lanka, he contracts himself to the size of a cat, so that he will not be detected by the enemy. Later on, he takes on the size of a mountain, blazing with radiance, to show his true power to Sita.
Read more about this topic: Vanara