The collective name for a group of rhinos is "a crash".
http://encyclopedia.thefreedictionary.com/Rhinocerous
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Yes, black rhinocerouses are mammals, specifically ungulants.
Elephants Elk Domestic Cattle Caribou Camels Hippopotomouses Whales Rhinocerouses Giraffes Water Buffalo Yaks Bison Muskox Gaur Cape Buffalo Moose
burghers. hmm lets see... Big Ugly Rhinocerouses Getting Hot Every Red Saturday? just a thought..
A group of Dolphins are called a Pod
A group of dolphins is called a pod. If that is your question.
a group of Blackbirds is called a murder
A group of shrews is called N.O.W.
A group of hens is called a brood.
A group of martens is called a richness
A group of grouses is called a covey
A group of grapes is called a bunch of grapes.