3053
Similar congregations of wintering bald eagles at open lakes and rivers , wherein fish are readily available for hunting or scavenging , are observed in the northern United States .
 location: United States
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 location: United States