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 ...

Only males emit this trademark ... of all North American frogs, this giant can grow to a length of 8 inches or more and weigh up to 1.5 pounds. Even the tadpoles of this species can reach 6. ...

For over 2 million years, dire wolves roamed present-day North America until their extinction around 10,000 B.C. On Monday, a Dallas-based bioscience firm said it had brought the species back to ...