No monkey-human pair can last forever. Illnesses and complications from paralysis often claim people young—Christopher Reeve died of sepsis when he was only 52, just nine years after his injury.

Affectionate and highly intelligent, capuchin monkeys are being trained to help people with disabilities with everyday tasks. NBC's Lester Holt reports.

NEW YORK (AP) — For the first time, researchers have used the cloning method that produced Dolly the sheep to create two healthy monkeys, bringing science an important step closer to being able ...

But people inexperienced with monkey behavior will often misinterpret a threatening facial expression for a friendly one. This can lead to dangerous encounters.