Quick Take Flatworms are invasive species in many countries including Europe. Because they can reproduce asexually and are voracious predators, they can disrupt local ecosystems. They arrive in ...

Planarians, flatworms known for their goofy cross-eyed gazes, may have to make an evolutionary trade-off between regeneration and sex – across different species of planarians, the same gene signalling ...

Add Yahoo as a preferred source to see more of our stories on Google. Three dogs are fighting outdoor. Dogs scare each other in an aggressive behavior in garden outdoor.© Take Photo/Shutterstock.com ...