One of the most interesting things I ever saw sailing was a singular monarch butterfly in the middle of the gulf-stream about halfway back from bermuda. This was over 300 miles away from any land (including bermuda).

It stopped for a very brief rest (a second or two at most) and then continued flying in the opposite direction. Very unexpected and surreal but this really speaks to the sort of distances they can travel without stopping.

Does anyone know how common these kind of sightings are? Very sad to find out that these butterflies are now considered endangered.