It is called the Harderian Gland. Its full functions are not yet fully understood. Some scientists say it might be a light sensitive organ.
Because you have blood in your eyes and
clean it make sure there is no blood left
Yes, but they may not sit there looking you in the eye.
because you are irritating the eye
For the most part, yes, they do. Gerbils, like other animals, have individual personalities, however. Some gerbils will not get along with other gerbils, regardless of gender.
Yes it is. Even though there is no genetic coding for red eyes, a lack of pigment can cause part of the eye to appear red.
gerbils are all born with tails but they have the ability to lose part of their tail. It will never grow back, and it will be harder for them to balance. They like their tails.
Gerbils secrete chemicals called porphyins from a gland by their eye, for various reasons. This is often mistaken for blood. If the amount is excesive and is forming a crust, the gerbil might be stressed. If it is only a small amount, then this is fine and nothing to worry about.
The sclera (white part) of the eye can become red from any type of irritation.
Gerbils sleep when ever they get tired. They are not nocturnal like some other small rodent animals.
No.They can only see to about 3 1/2 feet.
Gerbils do not have periods as they are oestral mammals and not menstrual ones like us. Some oestral mammals have a bloody discharge, but not gerbils. What you saw was most likely to be a smear of porphyrins from a gland near the gerbil's eye.