I volunteer at a small private zoo that houses several parrots, macaws and cockatoos that previously were pets but were relinquished by their former owners. The birds are outdoors on perches during the day and appreciate toys to help them pass the time. The problem is, the toys are destroyed extremely quickly and it is becoming prohibitively costly to replace them constantly. Are there any toys for large parrots that will last a while? I understand that this is not an ideal situation, but they are working with a large number of "rescued" birds and have to deal with some budget constraints.