Dr. Hal Puthoff claims the U.S. has recovered remains of four separate species of alien life from UFOs, citing people involved in the recoveries.

Scientists are listening in on sperm whale conversations and studying Earth's strangest microbes to prepare humanity for first contact with extraterrestrial life.

About 500 million years ago, not a single creature had a skull. Over time, these bony plates evolved into the structural marvels that vertebrates—animals with spinal cords, aka you, me, and your pug, ...

If an alien intelligence were hiding somewhere on Earth, many scientists suspect it might look something like an octopus.Get ...

A nutrition scientist applies metabolism, biology and food science to one of science fiction's oldest questions.

Alien plants and animals cost Europe over $1.5 trillion in the last six decades, according to a new study, indicating the global economic impact of such species could be several times higher than ...

A former CIA-linked physicist's comments about 'four alien species' have reignited UFO conspiracy theories online.

Introduction: Nonnative species in the world / David Pimentel -- The impacts of alien plants in Australia / Richard H. Groves -- Environmental and economic costs of invertebrate invasions in Australia ...