When new females were introduced, one resident female attacked them persistently, but these attacks waned after a few days and the new females were eventually accepted.
It clearly explains:
Juveniles appear to be immune from attack because of their low levels of testosterone, their small size, and possibly their juvenile behavior.
Thanks to Pascale from France for finding these photos of Dr.
Similarly, housing a familiar rat with the urine and feces of unfamiliar rats, then dousing him in unfamiliar urine, didn't fool the residents either.
In many cultures, including native tribes in North America, transsexual individuals have long had the choice to cross-dress and live their lives as women, including taking husbands.
A stable social hierarchy emerged, with one male rat consistently winning contests over the others.
In any case, dominance is usually not correlated with body size e.
In figure 10, the vaginal opening is way too far forward from the anal opening, and the vaginal entry is shown going first in horizontally and then turning upwards after passing a large web of skin in front of the anus.