The document discusses wild and isolated children and the critical age issue in language learning. It provides examples of children like Oxana Malaya, known as the "Ukrainian Dog Girl" who was found living with dogs in 1991 and still struggles with speech, and Sujit Kumar from Fiji who was raised by chickens in a coop and later learned some human behaviors through rehabilitation. The cases demonstrate how early deprivation from human contact and language can negatively impact development, especially language acquisition. The critical period hypothesis suggests there is an optimal age range for language exposure.