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.
Average life span in the wild: 15 to 20 years. Size: Head and body, 22 to 36 in (55.8 to 91.4 cm); Tail, 23 to 36 in (58.4 to 91.4 cm). Weight: 15 to 22 lbs (7 to 10 kg). Group name: Troop. Size relative to a 6-ft (2-m) man: Howlers are New World monkeys found in tropical Central and South America.They are aptly named for their cacophonous cries. When a number of howlers let loose their lungs in concert, often at dawn or dusk, the din can be heard up to three miles (five kilometers) away. gripping tail is particularly helpful to howler monkeys because they rarely descend to the ground. They prefer to stay aloft, munching on the leaves that make up most of their diet. Howler monkeys have beards and long, thick hair which may be black, brown, or red.