To give you an example of the intelligence and trust of elephants, I'll paste a paragraph of the November Diary of the Sheldrick Wildlife Trust. Mweya is an orphaned elephant raised by the David Sheldrick Trust. She has been living free in the Tsavo bush for some time now. Some of the keepers were recently out in the park checking for the "free orphans" and found Mweya (see below).
"Mweya was limping heavily, with a very swollen back leg which had obviously been pierced by a stick. The Keepers led her back to the Stockades, where our Mobile Veterinary Unit Vet assessed the wound and treated it. Mweya then remained close to the Stockades and presented herself each day for the foot to be treated indicating the implicit trust she had in her Keepers. Only when it had healed and was no
longer painful did she leave to return to her friends out in the bush."
The above is only one of many examples of the former orphans now living wild who know when they need medical care and where to go to get it. The Keepers have told me that some of the bull elephants know when they have worms and go back to the stockade to be treated. Many of them have shown up back at the stockades where they haven't been for months to have a snare removed.
They are far more intelligent and trusting than most of us realize.