Poultry farms across California are dealing with surge of avian influenza that is forcing farmers to euthanize several million chickens and ducks. The heartbreaking losses spell financial devastation for farms and also have the potential to trickle down to consumers, as prices for poultry and eggs go up due to supply chain disruptions. But the impact of the H5N1 virus has been far worse for wildlife. In recent months it has jumped from bird to many mammals as well and is now killing off species in every continent except Australia and Antarctica. The potential for the virus to spillover to humans can’t be ignored either. Here’s what you should know.