They weren’t snakes, of course, but nematodes, also known as roundworms—and, it turns out, they’re the most common ...

Meanwhile, the parent worm stays put and regenerates the lost tissue. In this way, a single R. multicaudata can dispatch tens ...

Even better, they’re much more sustainable. Insects need very little space, water, or food to grow, and they produce far fewer greenhouse gas emissions. For example, crickets need 12 times less feed ...