North American species like the Colorado potato beetle and the fall armyworm have become invasive elsewhere. Illustration by Marilyn Foehrenbach Q: In North America, we worry about invasive ...

But humans living in ice age North America had to deal with the real thing. Dire wolves (Canis dirus) were a canine species that hunted the plains and forests. They were similar to modern grey ...

There are over 150 different species of firefly in North America, and each has its own characteristic flash code. Male fireflies use their glow to attract females and, in some areas at certain ...