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.
Related Resources. by Terry Dunn. Howler monkeys are named and known for the loud, guttural howls that they routinely use at the beginning and end of the day. They are the loudest animal in the New World and while their howl is not a piercing sound, it can travel for three miles through dense forest.Black howler monkeys are inhabitants of Latin American rainforests, ranging through eastern Bolivia, southern Brazil and Paraguay, and northern Argentina.y Terry Dunn. Howler monkeys are named and known for the loud, guttural howls that they routinely use at the beginning and end of the day. They are the loudest animal in the New World and while their howl is not a piercing sound, it can travel for three miles through dense forest.