"Geese use the stars to navigate, but pigeons basically have tiny compasses in their brains."

But as the lava cooled, the tiny compasses froze in place, immobile even if the field shifted.

Experts called it paleomagnetism and found that the tiny compasses were often made of magnetite, a naturally magnetic mineral.

All that he needed was direction, which he found with the aid of a flashlight and a tiny compass, which came from the end of the torch.

The minerals behave like tiny compasses.

He had a tiny compass in the bottom of his special flashlight.

He also carried with him a tiny military compass he had owned for many years.

There were more instructions, whispered from the darkness; then, using a two-bladed paddle and guided by a tiny illuminated compass, Harry headed for Hawk Island.

Single-celled organisms have to be self-sufficient, packing all their behavioural repertoire into a tiny compass.

Blinking a tiny flashlight in the folds of his cloak, The Shadow consulted a tiny compass on the top of his fountain pen.