Which creature has the most powerful wings relative to its size?

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PhysicoRaj
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Which animal's (bird or insect) wings produce the highest amount of lift, despite having short wingspan or a fat body (proportional to it's wings' size)??
 
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Your insect is closely related to this squirrel:



Or, in other words - video you posted has nothing to do with the reality.
 
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So there can't be any insect with that much lift...right?
 
Having spent some down-time between jobs around the Gulf coast, I was quite impressed with the flying capabilities of the brown pelican. They are pretty massive-looking birds, and as they feed they are scooping up lots of salt water to get to the schools of small fish that they feed on. Impressive, strong fliers.

I expect though that the outliers will be in the realm of insects, though. Each summer, I anticipate the return of the assassin bugs, which can kill and lug off bumblebees that appear to be much more massive than they are.