Tropical plant knows whose bill is in its flowers
Choosy shrub takes pollen only when the right hummingbird comes calling
![green hermit hummingbird](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2015/03/kb_hummingbird_feat_free.jpg?fit=860%2C460&ssl=1)
DESIRABLE DINER A green hermit hummingbird has a long bill that can sip more nectar than other birds from the tropical plant Heliconia tortuosa, triggering the plant to start reproducing.
Matt Betts, Oregon State Univ.