The Question properlyunderlined .
The hummingbird combines upstroke wing muscles that are proportionally much larger than those of other birds with downstroke wing muscles that have the lowest recorded muscle strain of any flying bird, allowing them to reach a wing-flapping rate in excess of 50 strokes per second.
A : hummingbird combines upstroke wing muscles that are proportionally much larger than those of other birds with downstroke wing muscles that have the lowest recorded muscle strain
...
Quote:
The hummingbird combines upstroke wing muscles that are proportionally much larger than those of other birds with downstroke wing muscles that have the lowest recorded muscle strain of any flying bird, allowing them to reach a wing-flapping rate in excess of 50 strokes per second.
A : hummingbird combines upstroke wing muscles that are proportionally much larger than those of other birds with downstroke wing muscles that have the lowest recorded muscle strain
...
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