Population cycles of the Norway lemming are closely monitored by ecologists in northern Scandinavia.

A single wood lemming scurried across the mossy forest floor, disappearing into the tangle of roots.

The crew checked the LEM lifeboat's systems before descent.

The steppe lemming huddled beneath the tussock to escape the cold wind.

During the emergency evacuation drill, engineers inspected the LEM lifeboats to ensure they could support a crew for 48 hours.