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This is a reconstruction of an elephant brain based on MRI scanning. Its volume is 3,886.7 cc.   (A killer whale brain is about 5000 cc.)

Hakeem, et al., (2005). Brain of the African elephant (Loxodonta africana): Neuroanatomy from magnetic resonance images. Anatomical Record Part a-Discoveries in Molecular Cellular and Evolutionary Biology, 287A(1), 1117-1127.

Marino, et al., (2004). Neuroanatomy of the killer whale (Orcinus orca) from magnetic resonance images. Anatomical Record Part a-Discoveries in Molecular Cellular and Evolutionary Biology, 281A(2), 1256-1263