If you thought shearing sheep with googly eyes was creepy, your wrong.
The Haunted Cows are purple and have panicked anime eyes. And their heads are turning around and around.
They have 14 hearts and 1 shield of armor. Plus they hit. Bad. Taking away your health, first hit 4 and a half hearts.
When it kills you, it turns night. Same with if you kill it.
When you kill them they drop 3 Cow Eggs