Thank you for your inquiry to Drs. Foster and Smith. The Congo African Grey parrots are intelligent and need a lot of stimulation to keep them occupied. We suggest getting toys to shred and bang around. They also like games to play and things to listen to and watch. They seem to thrive on challenges and love tricks and puzzles.
Toys that would work are toys such as the following:
Willy Nilly Wood Bird Toy CC-34095
Bamboo Giraffes Large 12" x 24", CC-34750
Four-Way Play Activity Center CC-30791
Wheel Forager Bird Toy CC-74397
Buffet Ball 5" dia, CC-85734