What animal is 90% human?

No animal is exactly 90% genetically similar to humans, but several primates come remarkably close to this figure. Chimpanzees and bonobos share approximately 98.7% of their DNA with humans, making them our closest living relatives in the animal kingdom. This extraordinary genetic overlap explains many anatomical and behavioral similarities we observe, including complex social structures, tool use, emotional expression, and even aspects of culture and learning that pass between generations.

Following chimpanzees and bonobos, gorillas share about 98% of our genetic material, while orangutans share roughly 97%. These percentages might seem subtle, but the remaining 1-3% difference accounts for critical evolutionary divergences that occurred over millions of years—differences that led to our unique brain development, bipedal locomotion, sophisticated language, and advanced cognitive abilities. Even with such high genetic similarity, the expression and regulation of these shared genes create vastly different organisms, demonstrating that small genetic variations can produce significant biological and behavioral outcomes.