[Answer] Which bird has the biggest brain relative to its body size?

Step 1 : Introduction to the question "Which bird has the biggest brain relative to its body size?"

...Although its brain is usually smaller than a pea, the tiny hummingbird has the largest brain size relative to its body size. A hummingbird's brain takes up about 4.2% of the little hummer's body weight. Hummingbirds also have enlarged hearts, and about 30% of their body weight is carried in the powerful breast muscles needed for flying. Extensive studies over the years have discovered hummingbird's brains are capable of processing information and are capable of recall. In fact, male hummingbirds can track the timing of nectar production in the flower supplies within their territory, defend their territories, and court females. This suggests they are capable of episodic memory as well as serious multitasking. All this from a brain the size of a pea. Source: Gardening-for-Wildlife.com

Step 2 : Answer to the question "Which bird has the biggest brain relative to its body size?"

Hummingbird:

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