So today I went into a cave and found these two creatures in the cave.

When I went in I only saw a cow and no chicken then went into a tunnel near by and came back through a tunnnel connected to that one.

And when I came back...there was both the cow and the chicken.

There was also a cave sheep but when I first saw the sheep it was at the entrance above.

When I saw cow it was not by the entrance.

It was weird cuz cows and chickens can only spawn on grass and dirt and some other things thats NOT STONE right?

I've heard that if you find a chicken in your mine or a cave it means badluck,but that was on Herobrine videos.

Its really weird...I see NO WAY that a chicken and cow could spawn in a cave.

There was also a creeper and it fell from the ceiling which was also weird *Creepers cant spawn on ceilings.*

WHATS THIS MEAN!?