International Guide Dog Day falls on the last Wednesday of April each year, honoring the vital role guide dogs play in supporting the independence and mobility of people with visual impairments.On May 1, a day that celebrates hard work, let's meet some animal "model workers" who live in harmony with humans.Otters serve as "water quality inspectors" in rivers and wetlands their presence often signals ecological recovery.Alpacas are believed to help reduce stress and depression, as well as ease loneliness.Police horses assist with urban patrols and maintaining order at major events, showcasing both strength and discipline.Carrier pigeons once played key roles in wartime communication, delivering critical messages across long distances.(Cover: A rescue dog.
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