Cows and Donkeys

Iʻve never owned a cow or donkey but somehow have become attached to this random field of cows with two donkeys.  I drive past this farm 4x a day during school drop off/pick ups and thus it has become a habit of mine to take an interest in this particular field of farm animals.  Does anyone know why donkeys are always paired with cows?  Iʻve often wondered.  Iʻve also always wondered whether donkeys actually lie down to sleep - I have only ever seen them sleeping whilst standing up!  That is until today - I saw the dark grey donkey lying down in the middle of a field all by itself.  It would have made for a funny picture.  This particular field of cows has one cute little baby cow - every morning the kids and I play this game...who can find the baby cow first?  Addley seems to think that this baby cow could come home with her and sleep in her bed.  Saige seems to think that donkeys drink orange juice and cows drink milk.  Dayton always spots the donkeys first.  Anyhow, I know nothing about these animals or their behaviors but somehow they have just become a part of my daily life here in Tennessee.  This whole post was inspired by this one single black cow today that was hiding behind a tree.  I say hiding because there were no other cows in the field with it and it was standing behind a tree with its head poking out.  Almost as if to say, no mister farmer, I do not wish to follow the herd.  I shall stand here all day today and enjoy the sunshine.