[Answer] What do elephants, rhinos, hippos and sloths have in common?

Step 1 : Introduction to the question "What do elephants, rhinos, hippos and sloths have in common?"

...Elephants, rhinos, hippos and sloths are all mammals who give milk to their babies when they're first born. They all have backbones, are hairy and produce their own body heat. This means these mammals spend more time with their babies. Because it takes more time they also share another trait: they can't jump. There are actually three types of mammals: eutheria (placental mammals), marsupials (also called metatheria) and monotreness. Source: Reference.com

[Answer] What is a herd of rhinos called?

Step 1 : Introduction to the question "What is a herd of rhinos called?"

...A group of rhinos is aptly named, considering the reputation of these mammals. A rhino group is a crash. Males and females will establish their own territories and defend it. The males will mark their territory to warn away other males. There are five species of rhinoceros: African (both black and white,) Indian, Javan, and Sumatran. Black African, Javan and Sumatran are on the critically endangered species list. African white rhinos have the largest number still surviving in the wild. These herbivores have no natural predators, other than human beings. Source: Reference.com

[Answer] What is a herd of rhinos called?

Step 1 : Introduction to the question "What is a herd of rhinos called?"

...A group of rhinos is aptly named, considering the reputation of these mammals. A rhino group is a crash. Males and females will establish their own territories and defend it. The males will mark their territory to warn away other males. There are five species of rhinoceros: African (both black and white,) Indian, Javan, and Sumatran. Black African, Javan and Sumatran are on the critically endangered species list. African white rhinos have the largest number still surviving in the wild. These herbivores have no natural predators, other than human beings. Source: Reference.com