7535
The present study assessed associations between immune function , prefledgling survival , and selected organochlorine compounds and metals in herring gulls ( Larus argentatus ) and black - crowned night herons ( Nycticorax nycticorax ) in lower New York Harbor during 2003 .
 Chemical: organochlorine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: organochlorine