Technically, they can keep producing babies as long as they get an unlimited amount of food. But in reality there is an upper limit. Studies were done by the scientific team which brought the Shriekers to Perfection Valley in the series. They found that it requires tremendous effort to “birth” the baby and this takes quite a toll on the Shrieker’s body. After producing ten to twelve babies, an adult often dies suddenly of apparent heart failure. In the wild a Shrieker would rarely be able to get enough food to reach that state.

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