IN NUMBERS

30.4 KM

The width of an impact crater discovered under 800m of ice in Greenland. It is thought to be the result of a 1.6km-wide iron meteorite that slammed into the planet 12,000 years ago.

13,000 KM

The distance flown by willow warblers during their autumn migration – the furthest ever recorded for a bird weighing less than 10 grams.

4,000 YEARS

The age of a vast network of termite mounds found in a tropical rainforest in northeast Brazil.