In a twist of fate that couldn't be more perfect for the Halloween season, researchers have discovered that six species of North American bats glow green under UV light. The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.

Last year, scientists discovered that the Mexican free-tailed bats' toes twinkled a greenish-blue under UV light and it may be used as their own bat signal to communicate. Now, it's the bats of North America's turn to be revealed as glow-in-the-dark species – the first known winged mammals to emit an all-over body glow in this part of the world. However, scientists are not sure why they do.

“It may not seem like this has a whole lot of consequence, but we’re trying to understand why these animals glow,” said study co-

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