vibudhāḥ pitaro ’surāḥ
sargās te viśva-sṛk-kṛtāḥ
As explained in the Second Canto of Śrīmad-Bhāgavatam, the Siddhas are inhabitants of Siddhaloka, where the residents travel in space without vehicles. At their mere will they can pass from one planet to another without difficulty. Therefore, in the upper planets the inhabitants are far superior to the inhabitants of this planet in all matters of art, culture and science, since they possess brains superior to those of human beings. The spirits and jinn mentioned in this connection are also counted among the demigods because they are able to perform uncommon functions not possible for men.