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.
Although the reason why dogs howl lacks any solid scientific study or research but there are several theories that are prevalent, which answers this niggling query. One of the reasons behind your dogâs howling is that itâs trying to communicate with the sound source, which may be fire engine or another dog howling for that matter.