Quick Take Flatworms are invasive species in many countries including Europe. Because they can reproduce asexually and are ...

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 ...