JS describes beasts in heaven based on Revelations.
"Discourse, 8 April 1843, as Reported by William Clayton–A," 2, The Joseph Smith Papers website, accessed March 23, 2021
John saw the actual beast in heaven, to shew that that being did exist there. when p saw they were images types to represent & they received an interpretation. I set it forth by this broad dec— where God ever gives a vision of an image &c he always holds himself responsible to give a Rev. or interpretation. otherwise we are not responsible— dont be afraid of being damned for not knowing this where God has not given a Rev. read Rev 5— 11— particularly verse 13, John saw curious looking beasts in heaven— saw every creature that was in heaven &c— all the beast foul fish in heaven— actually their giving glory to God. I suppose John saw beings there that had been saved from 10000 times 10000 earths like this— strange beasts— might be seen them in heaven.— John learned that God glorified himself by saving all that his hands made—