From the Greys to the Nordics, these aliens appear frequently across abduction stories and science fiction tales.

Some creative calculations using bug traps, epidemiology and trees suggest there are some 20 million unique insect species on ...

Some woodland animals look so strange and otherworldly that encountering one feels less like a nature sighting and more like ...

Lionfish, mitten crabs and “sea vomit.” Meet eight marine species inadvertently brought to new territory that are taking the ...