The Detroit Zoo has euthanized a 13-year-old grizzly bear named Mike after months of health complications. Mike and his brothers, Boo and Thor, were rescued as orphans from Alaska in 2011 and brought to the zoo. Despite intensive care and consultations with outside veterinary neurologists, Mike's condition continued to deteriorate, showing symptoms like discomfort, loss of appetite, and inability to rise from lying down. The decision to euthanize him was made when all treatment options were exhausted. The zoo staff is heartbroken and a necropsy has been scheduled to understand the underlying causes of his health issues. Boo and Thor will continue to be monitored to ensure their well-being.