Has an animal saved your life?Studying Arctic birds helped resuscitate those suffering from hypothermia.An ECG on the 150kg heart of a humpback whale has extended the lives of patients with heart failure.Understanding giraffes' long necks has led to improved asthma treatment.Learning how animals survive and thrive has led to life-saving advances for human health. But we still have a long way to go. Intensive care doctor Matt Morgan looks at why animals can be the key to understanding how our bodies work - and how to fix them when they go wrong.