Tag Info

New answers tagged

0

When asking why a particular group of organisms, such as mammals, has a particular feature, such as a long snout, you must be careful about the hypothesized reasons. While the other answers here propose various adaptive reasons, they do not actually explain the presence of the long snout in the majority of mammals. Instead, you have to look at the ...


0

Long snouts may have an advantage in long noses. A longer nostril could give more room for olfactory neurons and allow for a more sensitive sense of smell. Animals would rely on smell to find prey or avoid predators, so better smell would give better advantage. The only predators I can think of off the top of my head that would have short snouts would be big ...


0

I'm not a scientist, so this is my best guess: Since humans are an uncommon exception among mammals for lacking snouts, we should find the benefits of a snout by looking at other ways that humans are unique among animals, enabling us to not have snouts. I think the answer is the opposable thumb; animals need snouts because it does for them what thumbs do ...


3

Most mammalian males have nipples. The duck-billed platypus does not have nipples but you begin to see development of nipples in marsupials (Park and Lindberg 2004) like the opossum and kangaroo. Development of a complete nipple begins in the eutherian (placental) mammals. The mammary glands develop early in the embryo along a pair of ridges called the ...



Top 50 recent answers are included