Why was the origin of species published so fast?

"On the Origin of Species" was published quickly due to Charles Darwin's extensive preparation and research over many years, including his observations during the voyage of the HMS Beagle. The scientific community was becoming increasingly interested in evolution and natural selection, prompting Darwin to publish his findings to establish priority. Additionally, he faced pressure from peers and the potential publication of similar ideas by Alfred Russel Wallace, which motivated him to finalize and release his work in 1859.