The other situation is if mom has O type blood. The same thing can happen as with the (-) and (+) blood type difference, but it is not as severe. If mom has O+ or O- blood type, and the baby has A+, A-, B+, B-, AB-, or AB- blood type, an ABO incompatibility can develop.
Why do howler monkeys howl? Howler monkeys live in family groups in the rain forests of South America. They howl so that other monkey groups do not stray into their territories. The sound also helps group members stay in contact with each other. Monkeys are communal animals that live in exclusive groups.
1 Cocker Spaniels also need a lot of attention, so usually when you leave them at home alone in a crate or locked in a room, they will howl. 2  Unless you've trained your dog to not pee in your bed at night, keep them in a crate next to your bed. 3  If you leave them in the kitchen alone, they most likely will start to howl.