Sheep's cries are the vocalizations made by sheep, which are a domesticated species of mammal. The most common sound made by sheep is known as a 'baas, ' which is a four-letter word in the crossword puzzle. Another sound made by sheep is known as a 'BLEAT, ' which is a six-letter word in the crossword puzzle. Both of these sounds are used by sheep to communicate with one another and to express their emotions.