There are more than 5000 species of mammals on Earth. The platypus has two ovaries but just among the two is functional i.e. the left one. An elephant’s feet can weigh over five tons which means they have large heavy feet. But they have big, soft, spongy feet that spread their weight out so well they hardly even leave footprints. The sweat glands of a tree squirrel are situated on their feet. Mammals have the ability to maintain a constant body temperature naturally, irrespective of the temperature of their surroundings. A normal body temperature of mammals ranges from 90-104F.
Did you know that a female Pacific Grey Whale gestates and delivers a 2000 pound infant, migrates over 10,000 miles, and produces 6 heaps of breast-milk without eating a bite of food, using just her blubber for fuel? The lower jaw in mammals consists of a single bone. Gray squirrels are considered to be living fossils. The cause of this is they have not changed much in 37 million decades. Shrews have so little body fat they cannot go over a few hours without food. They will die if they skip a meal. The gerbil rubs its abdomen on cage accessories to mark his territory. Humans also fall in the category of mammals. The middle ear of mammals comprises 3 bones. A polar bear’s skin is black beneath its hair that look white but in fact are colorless and hollow. Sugar gliders have the ability to glide over 150 feet. Golden hamsters are also known as”Syrian” hamsters, since they originated in Syria. A female hippopotamus give birth and breastfeed under water – even though almost all of their predators live in the water.