Brain size area in women, corresponding to spatial versus language specializations. Small studies have attempted to link brain volume with functional measures such as P300 auditory evoked potentials but finding no association. Studies attempting to related sibling differences in IQ to differences in brain volume are hampered by relatively small sample sizes and the noisy nature of such difference scores, yielding weak evidence for cross-trait cross-sib correlations. The largest brain is that of the sperm whale, weighing about , and killer whales, weighing about . An elephant's brain weighs just over and a bottlenose dolphin's . Brain size tends to vary according
Killing of animals by crawling up the target's nose and eating the targets' brain. Most attacks happen in moist areas like ponds or lakes. In the middle is the blowfish ("fugu") that can kill animals with its toxic organs that contain tetrodotoxin. The largest animal killer is the blue whale, which is the largest animal on Earth. The blue whale mostly feeds on krill ("euphausiacea") which is a small, abundant crustacean. Blue whales are almost entirely killed by killer whales and by humans. Chimpanzees wage war against rival groups, killing rival males and eating the baby chimps. Ants also wage warfare on other