21699
In this example , Anolis caudalis appears to experience divergence in the color and pattern of an extensible throat fan , or dewlap , in areas of contact with closely related species at the northern and southern limits of its range .
 None
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