Darwin's Voyage

In 1831, a young amateur scientist, Charles Darwin, embarked on a 2-year epic journey, but the journey lasted 5 years and culminated in the discovery of something that would shake the world. In this parallel universe there are Monster Girls, which led Darwin to elaborate a theory a little different from the one you know. The story has no commitment to reality, but is partially faithful. Any resemblance to reality is accidental and disastrous.