Question

People easily identify humans, bears, dogs, cats and cows as types of mammals. However, they tend to exclude bats, dolphins, and whales as types of mammals because these do not match our for the concept:

Answer 1

The term mammal generally refers to the group of animals constituting the class mammalia.The females of this class have mammary glands for producing milks.All the classes have been divided since a way long back before,200 million years ago.But their are many mammals which we know about and also have studied about them,like humans,cows,dogs,etc.But there are a large number of species which are termed as mammals ,but we are least known to them for example bats,dolphins,whales and many more.People have a conception in their mind that all mammals must have all the features that a mammal required like have hair and fur in body,four chambers in heart,they must be endothermic vertebrates,must have mammary glands,but some of them doesn't have all the characterist but termed as mammals like bats,Bats are the only mammal which can fly.The bats give birth to the young once and have hair over the the body,making it an mammal.

People have a misconception that mammals are only land animals and are bigger in size,leads them to this wrong concept.The people should avoid this type of misconception in categorization of mammals,because mammals are found in land,water and sky also.People also have a wrong concept that mammals give birth to a young once but it has been found that their are a few mammals that lays egg.