Some dolphin species in the last few million years had snouts that were up to five times longer than their heads (botos have snouts two times longer). They lived in times of rising and warming seas when having extended snouts could have been useful for sweeping through schools of fast-moving fish. Prehistoric Dolphins Had Long Snouts Due to Climate Change - The Atlantic
Two years ago I've photographed this fossil skull of an iniid dolphin at San Diego natural history museum.