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.
Why the Coyote Howls at the Moon. Lunar influences affect the behavior of coyotes. Coyotes, also known as prairie wolves, howl for a variety of reasons. Howling is a natural communication behavior displayed by coyotes. Basic howling is used for several reasons, including alerting other prairie wolves in the area of their presence.