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Adult male and female rats leave drops of pee everywhere to advertise their sexual availability. Pee contains a lot of information about the rat who made it
Adult males, especially socially dominant ones, mark the most. Males mark even more when they smell a female nearby! Male marking is influenced by testosterone: neutered rats mark less than intact rats.
Females mark less than males. Females do most of their marking the night before they go into heat (every 4 days). Females also mark more when they can smell other rats nearby, and females prefer the urine marks of high-testosterone males.
But attracting rats of the opposite sex isn't the only reason rats mark. Rats use their own urine marks too.
Rats mark because they like things to smell like them. Having lots of personal smell around may comfort them. It may help them become familiar with an area.
Rats mark in response to novelty, too. Put a new object in a rat's cage and chances are, the rat will mark it. They also mark more when they smell something new to them, like a strange rat, or a cat, or mint.

Rats may also mark because it helps them know where they are and where they've been. Rats will re-mark an object that has been moved to a new spot.

Rats are also capable of following the odor trails they have left through the environment.
rats start to play around 18 days of age, playing increases and peaks at 30-36 days, and declines thereafter.
Both male and female juvenile rats play, though males play at higher rates than females.
From weaning to sexual maturity at around age 56-60 days, the rates at which young male rats pin each other to the ground become progressively asymmetrical -- eventually, one animal pinned the other on average 70% of the time, and his pins lasted longer too. At first, it was believed that this young top rat would become the adult alpha rat. In other words, stable adult dominance hierarchies emerged out of this asymmetry in play. However, the picture turns out to be more complicated than this!
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