The weight of the hummingbird brain is 4.2% of its total body weight, much larger than other birds.
Researchers at the University of British Columbia have found that hummingbirds process motion differently in that they are able to detect movement equally from all directions. Other birds as well as amphibians, reptiles and mammals better detect motion in their peripheral vision, which better enables them to flee from predators. Hummingbirds, however, who move at high speeds often in cluttered environments, need to be aware of subtle movements from all directions.
Researchers in Alberta have determined that the hippocampal formation is two to five times larger compared to other birds, and it is this area that is responsible for the hummingbird's "episodic-like" spacial-temporal memories. A hummer will not only remember where every flower in its territory is located, but also how long it will take for each flower to replenish its nectar.