Yes guinea pigs have nipples.
In fact they have four pairs of them! The reason you might not have noticed them before is that they’re quite small and unassuming.
The main purpose of nipples is to enable mammals to feed their young.
When a baby guinea pig is born it will latch on to its mother’s nipples and drink milk.
This milk is full of nutrients and antibodies which will help the baby to grow and stay healthy.
Interestingly both male and female guinea pigs have nipples.
However only the females will produce milk.
So if you’re ever wondering if your guinea pig is male or female you can always count their nipples!
Why Do Guinea Pigs Have Nipples?
Most mammals have nipples including guinea pigs and there are a few reasons why.
For one nipples are a key part of the mammary gland which produces milk for nursing young.
Nipples also help to regulate body temperature as they are full of blood vessels and are highly sensitive to changes in temperature.
Finally nipples are sexually dimorphic meaning that males and females have different types of nipples.
In female mammals the nipples are usually larger and more prominent while in males they are often smaller and less noticeable.
There are a few theories as to why male mammals have nipples even though they don’t typically nurse young.
One theory is that male nipple are a vestigial remnant of our evolutionary history.
In other words male nipples are a holdover from a time when our ancestors were furry four-legged creatures that nursed their young.
Another theory is that male nipples serve an important purpose in sexual arousal and stimulation.
Regardless of the reason it’s clear that nipples are an important part of the mammalian body and guinea pigs are no exception!