Lucy warily eyes a squirrel which is thirty feet up in the silver maple tree.

Although Lucy is always ready for a game of Chuck-it!, she still keeps an eye on things.
This fox and I regarded one another with a mutually safe distance between us.
On a gloomy afternoon, a Snowy Owl watches me watch him.
A House Sparrow keeps a watchful eye on me as it cracks open a sunflower seed.