From the Reise der österreichischen Fregatte Novara [...] Zoologischer Theil, A. Pelzeln, "Vögel":

"Atlantic Ocean, not far from the Cape
An individual killed on 20 September 1857 at 36° 22' south latitude and 5° 29' west longitude by Baron Wüllerstorf. Total length 8", flight distance 23". Weight 8 ½ ounces (?) - As only one wing of this bird was down, it swam for a while behind the frigate until it could be reached by lifeboat. As he swam, the cape pigeons pecked him so hard on the head with their beaks that some feathers were missing. Zelebor." (p. 147)