Mystery Macro

Thank you Osuzanna for hosting Tiny Tuesday with the theme "Mystery".
I think it is not too mystery ;-)
I solve the riddle in my next blip :-)

It must be about 8 years since we gave Omo the last drive in the bike trailer. Today we tried it again get more mobile with him, despite of his hurt knee.
Obviously he remembered it and get into the trailer without hesitate. And as you can see in the extra, he seemed to enjoy it :-)