I'm pretty sure "winter raptures" is a typo but it's a great one. Winter raptures, indeed - perfect words to describe a chilly trip to Killdeer Plains. I have very fond memories of birding there (and getting my life Long- and Short-eared Owls) in college.
You are correct about that typo! I have jokingly refered to them as "rapures" for so long, I must have been on auto-pilot!But is it true: Killdeer is filled with "winter raptures"!