23714
Cyclic variations in the strontium isotope ratios within the tooth enamel of a 300,000 - year-old fossil imply that a population of " Diprotodon " undertook regular , seasonal migrations across the Darling Downs , making it the only known extinct or extant metatherian known to migrate annually .
 location: Darling Downs
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Darling Downs 
Answer:
 location: Darling Downs