Brooke Jarvis writes in The New Yorker:
“As the recent arrivals cleared land for their own purposes, they also created fresh habitats for mosquitoes, allowing their populations to skyrocket.”
The recent arrivals — those darn colonists — somehow overran the New World by creating fresh mosquito habitats. I thought it was sex that made babies, but apparently I was wrong.
(Note to self: Be careful of the possessive pronoun their, which doesn’t always clearly tell the reader who they are.)