RESEARCH BASE
Search 3,721 documents across 34 fields — every claim tier-rated by evidence
3,633 are the core, quality-scored corpus (34 lettered sections — see How We Work); the remaining 88 are cross-corpus synthesis documents (68 InterDocs, 12 Connections, 8 Theories) also indexed here.
2 results for "orangutan"
ZB_1_09 — Tool Use in Animals
Tool use — defined as the deployment of an external object to alter the form, position, or condition of another object or organism — was once considered uniquely human. Since Jane Goodall's 1960 observation of chimpanzee
R_2_10 — Primate Evolution and the Hominid Lineage
The order Primates, originating ~65–80 million years ago, encompasses prosimians (lemurs, tarsiers), monkeys, and apes. The human lineage (Hominini) diverged from the chimpanzee lineage ~6–7 Mya, based on molecular clock
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