4104
The copper shark is easily mistaken for other large " Carcharhinus " species , particularly the dusky shark ( " C. obscurus " ) , but can be identified by its upper tooth shape , absent or weak interdorsal ridge , and lack of obvious fin markings .
 animal: dusky shark
Given options, please tell me the categories of all the listed entity words.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} 
 Entities: dusky shark 
Answer:
 animal: dusky shark