{"fact":"Around 90% of adult Hawaiian crows and 40% of juveniles successfully used tools to retrieve food in a study.","context":"About 90% of adult crows and 40% of juveniles used twigs to successfully extract the food (81 of 104 birds).","source":"Natalie Uomini; Gavin Hunt, A new tool-using bird to crow about, 10.3758/s13420-017-0262-5","index":513}