No, the pouches aid in the animals’ breathing. If you watch closely in T-2, you can sometimes see them pulsating. Baby Shriekers grow from eggs lining the stomach walls of the adult, feeding directly on digestive products there. When an adult eats enough, one of the eggs suddenly starts to grow, forcing its way into the stomach cavity and up the throat. Yech.
It’s not clear why only one egg is “triggered” at a time.
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