Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. In a Costa Rican ...

The creature is small, somewhat furtive and green. Sometimes it’s brown. It has a voracious appetite for insects and spiders but is completely harmless to people. It clings to walls and screens and ...

Every morning in Miami, our fieldwork begins the same way. Fresh Cuban coffee and pastelitos — delicious Latin American pastries — fuel our team for another day of evolutionary detective work. In this ...