17588
Subordinates with few reproductive opportunities delayed dispersal and remained in the natal group to provide alloparental care to siblings , thus allowing dominant reproductive females to meet the energetic needs associated with high rates of reproduction and successful infant rearing .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None