Avery had been watching the dancing lights over his shoulder. “They’re like eyes watching us...Before a colony’s sent out here, these damn things will have to be destroyed. They’d be dangerous flying loose around electricity.”
Far down the beach, Avery and Jason saw the white flash of the explosion, saw the black gullies light up in a ghastly swift glare. Then came a rolling sound and a jar of concussion.
Republished in Sail 25 and other stories, Spatterlight, 2012
Full story at the Internet Archive: pages 92-93: https://archive.org/details/Galaxy_v03n03_1951-12/page/n93