33940
Herbivorous animals , which depended on plants and plankton as their food , died out as their food sources became scarce ; consequently , the top predators , such as " Tyrannosaurus rex " , also perished .
 location: Tyrannosaurus rex
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: Tyrannosaurus rex 
Answer:
 location: Tyrannosaurus rex