2050
The willie wagtail was released in Hawaii around 1922 to control insects on livestock , but the introduction was unsuccessful and the last sighting was at Koko Head in 1937 .
 location: Hawaii; location: Koko Head
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 location: Hawaii; location: Koko Head