I cheated and read a bit.
The only thing I found, so far, is the Hummer will lay the eggs and nest without any help from the male. They eat Nectar. These are the only two, with exception to the flight difference, I've found reading, so far.
OK, 'hover' is close enough, so I'll not be picky & give you and Becky that one...
One of the things a hummer CAN do that other birds CAN'T is
fly backwards
One more 'can't' and 2 'cans'.
If no one else replies in a bit, I'll go ahead and post the answers.
:)