Energy efficiency - 12 gram bird flies 2,700 km non-stop in three days

[jonathan75]

I don't think even a recumbent cyclist could do that, somehow.

http://www.cbc.ca/m/news/technology/tiny-blackpoll-warbler-flies-3-days-non-stop-in-record-migration-1.3017544

 

[trex]

it may have followed the jet stream