Merops Orientalis

For instance, a green bird enters a green tree not to become one with the tree but to enjoy the fruits of the tree. Impersonalists generally give the example of a river flowing into the ocean and merging. This may be a source of happiness for the impersonalist, but the personalist keeps his personal individuality like an aquatic in the ocean. We find so many living entities within the ocean, if we go deep. Surface acquaintance with the ocean is not sufficient; one must have complete knowledge of the aquatics living in the ocean depths.
Because of his pure devotional service, a devotee can understand the transcendental qualities and the opulences of the Supreme Lord in truth. As it is stated in the Eleventh Chapter, only by devotional service can one understand. The same is confirmed here; one can understand the Supreme Personality of Godhead by devotional service and enter into His kingdom.
(BG 18.55 purport)

Your son Kṛṣṇa appears as an incarnation in every millennium. In the past, He assumed three different colors—white, red and yellow—and now He has appeared in a blackish color. [In another Dvāpara-yuga, He appeared (as Lord Rāmacandra) in the color of śuka, a parrot.] All such incarnations have now assembled in Kṛṣṇa.
(SB 10.8.13)