If you knew much about rats, you would know that is not blood, its porphyrin and they get it when they are stressed out. It is the red color and appears like blood, but it is not. There is other reasons they get it, but the most common is stress.Originally Posted by king2005
I took the above statement from a website.Rats produce a lubricating secretion called porphyrin that is manufactured by the harderian gland which lies behind the eyeball. It is stained red with a pigment called porphyrin. When a rat is stressed, this bloody looking mucus may be produced in an over abundance and stain their nose or eyes. Sometimes it looks like bloody tears coming from their eyes.






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