The leech is the animal with 32 brains and a leech's internal structure is segregated into 32 separate segments, and each of these segments has its own brain.
Leech is an annelid.
The sperm whale is also the animal that has the largest brain.
The largest brains are those of sperm whales, weighing about 8 kg (18 lb).
An elephant's brain weighs just over 5 kg (11 lb), a bottlenose dolphin's 1.5 to 1.7 kg (3.3 to 3.7 lb), whereas a human brain is around 1.3 to 1.5 kg (2.9 to 3.3 lb). Brain size tends to vary according to body size.