27699
More unexpectedly , sparrowhawks ( Accipiter nisus ) , which prey almost exclusively on birds , had similar exposure rates to species which prey on rodents .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None