Heaviest Animal Brains
Key Findings
About This Dataset
Heaviest Animal BrainsThe sperm whale (9 kg) has the heaviest brain of any animal, ahead of the killer whale (5.6 kg) and the African elephant (5 kg), the largest-brained land animal. These giants dwarf the bottlenose dolphin (1.6 kg) and human (1.4 kg) in absolute terms - the sperm whale's brain outweighs a human's more than sixfold. But absolute size is misleading about intelligence: the human brain is far larger relative to body mass, and brain structure matters more than raw weight. The list is dominated by large marine mammals precisely because big bodies support big organs; the dolphin and human make the ranking despite modest size thanks to unusually large brains for their body weight, a trait linked to their complex social behaviour.
Data Insights
Numbers, trends & sources behind this chart
Methodology & source
- Data source
- Whale and Dolphin Conservation / references
- Coverage
- 5 entities · 5 observations
- Measure
- Brain Weight (kg)
- Last updated
- 12 July 2026
- Compiled by
- The ANYSTAT team, from the source above
- Values are shown as reported by the source. Nothing is rescaled, rebased or converted — the only changes are thousand separators and decimals shown to two places.
- Entities are ranked highest-first on their value.
Data Sources & References
All external sources cited in this dataset
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