Great pictures Janneke! I am jealous that you get to take Tillo to the zoo.
Mojo also has a donkey friend, his name is Billy. He is the lone donkey in a herd of horses where I used to live/work. The dogs had to do their business down by the fence and whenever I let Mojo out to go, he couldn't concentrate if Billy was over in that area. He just HAD to go try and play and pull out Billy fuzz. lol He could care less about the horses most of the time, except of course if they were running around being hyper idots.
My pictures are very poor and from a distance, but here's Mojo trying to entice Billy into a little play.
And yes, donkeys can be very stubborn!