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 Social animals: Red Howler Monkeys usually live in a group of 10 to 15 individuals that includes a few males, several females, and young monkeys. 2  Vegetarian: Howler monkeys are the only New World primates with a diet that mostly consists of leaves.3  They also eat nuts, some fruits, and occasionally take bird eggs. Social animals: Red Howler Monkeys usually live in a group of 10 to 15 individuals that includes a few males, several females, and young monkeys. 2  Vegetarian: Howler monkeys are the only New World primates with a diet that mostly consists of leaves. 3  They also eat nuts, some fruits, and occasionally take bird eggs.