system
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human
Do Monotremes have a single occipital condyle?

Mammals have paired occipital condyles. I read that monotremes have only one. What besides milk classifies  them as mammals?
gpt
Yes, you are correct. Monotremes, which are a group of mammals that includes the platypus and the echidna, do have a single occipital condyle. This is a feature that is unique to monotremes among mammals, as most mammals have paired occipital condyles.

Monotremes are classified as mammals for a number of reasons, even though they have some unique characteristics that set them apart from other mammals. For example, in addition to having a single occipital condyle, monotremes are the only mammals that lay eggs instead of giving birth to live young. However, like all mammals, monotremes have mammary glands that produce milk to feed their young. They also have hair on their bodies and are warm-blooded, which are both characteristics of mammals.

In addition to these physical characteristics, monotremes also have certain physiological traits that are characteristic of mammals. For example, they have three middle ear bones, which are used to transmit sound from the outer ear to the inner ear, and they have a neocortex, which is the part of the brain responsible for higher cognitive functions. These traits are present in all mammals, including monotremes.