WHY DO MALES HUMMINGBIRDS DIVE AT FEMALES?
A report from researchers at the University of California Riverside explains why male Costa's hummingbirds try to hide the speed of their dives from potential mates.
The females are more attracted to speedy males than slower ones.
Therefore, by hiding their speeds, the males make it harder for females to evaluate their abilities.
This image shows the flight path of a male Costa's hummingbird. A female hummingbird was in the cage
The birds 'hide' their speeds by diving at the females' sides.
If they dove directly in front of them, the sounds produced by their tails would let the females better gauge their speeds.
For the new report the researchers used a tool called an acoustic camera that documented the males' dives.
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