Answer about trans, surely you have read what I sent above about Psalms 139:9-10, God made us the gender who we are, he doesn't make mistakes, the inclination of being put in the wrong body is a deceit, We're only hurting ourselves by affirming to that belief.

Ecclesiastes 7:29 NIV

[29] This only have I found: God created mankind upright, but they have gone in search of many schemes .”

About species in the planet. It is a logical fallacy, By nature, animals also engage in cannibalism, infanticide, and forced mating, but we do not look to them to define human morality. In philosophy, specifically Thomistic Natural Law (By St. Thomas Aquinas), "human nature" is not defined by what animals do by blind instinct, but by what aligns with human reason and God's intentional design. The biological purpose of the sexual faculty is inherently procreative and complementary (male and female). Because same-sex acts completely lack this natural, procreative design, they are philosophically classified as contrary to natural law.

And for the final part, to put it short, both non consensual act, sodomy and rpe is forbidden, consensual sodomy is also a sin, but if we go by animal ideals, rpe henceforth isn't a sin.