They have the largest hippocampus to brain ratio and have 3D spatial memory of all their food source locations as well as (with ravens) who their human enemies are.
We can learn a lot about memory from these birds
The hummingbirds hippocampus allows for an astonishing memory which will give them a 3d map to all the food-nodes it knows of.
What I wonder is if the flapping of the wings is so unconscious to the fore-front of the birds intentions, such that ALL of its awareness is in its intent to find food - and she looks, and steers her head wherever - but the hippo just complies and manages flying the bird - think of the hippocampus as an in flight navigator that the frontal perception of the bird can dial in and direct.
what would be interesting would be to map out feeding locations, then see if the follow the same route?
(p.s. Ive captured hummingbirds and even taken them in an Uber, had them fly around inside of the car on a freeway... and had one that met me at breaktime daily)... they are my spirit animal...
but I think their hippocampus-brain ratio is the key to memory