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.
Howler Monkey â Genus Alouatta Introduction. The Howler Monkey is a large type of New World Monkey. There name comes from the fact that they are louder than any other types of Monkeys. They often call as the sun comes up and as it is going down. They also howl to warn of dangers. They are believed to be the loudest of all land animals. Description