Bear with me here because these are not my own ideas.. these are ideas taken from past issues of the Rat Fan Club's newsletter, which I'm compiling here so I don't have scraps of paper everywhere!
The five common obstacles, according to the North of England Rat Society, are the bridge, the see-saw, the hoop jump, the weave poles, and the long tube. Ideas can be seen here: www.neratsociety.co.uk/1stshow3.htm, www.furryfeet.co.uk/ratalbum.htm, pipsa.flaming-trout.com/fences.html (not in english), and www.midlandsratclub.org/shows.shtml(search agility).
The easiest obstacle is the hoop jump. It can be done as simply as using an empty cardboard center from a roll of packing tape and a squat, sturdy bowl. Tip the bowl upside down and tape the cardboard roll to the bowl's base. There's your hoop jump! To teach your rat to go through this, you need to lead the rat through the hoop with food. Make sure the rat is all the way through the hoop before you reward with a treat.
The next one to try is the A-frame. Make it from thin wood or heavy cardboard. Ramps average from 6 - 12 inches long. They should be 5-7 inches wide. The entire ramp will be like a triangle, with a base for support. If using wood, be sure to sand it well. Glue or tape together and cover the ramp with a non-slip surface. Teaching the rat is down also would food lead and reward.
There is also ideas for hurdles using legos! The rat must jump a series of hurdles in order to get their treat!
The last one I wanted to add here is a test for the rat's sense of smell more than a part of agility. In a large cardboard box, put a small bowl with a scent in each corner. Place the rat in the center to find their preference. Either rotate the scents each trial or put the rat in facing a different direction. You can do food smells or not, but be sure nothing is toxic. Record the order the smells are visited for 60 seconds. This was even done as a science fair project, with the student hypothesizing that rats would prefer sweet smells! Kind of neat!
Just so more bits and pieces of info I didn't want to lose track of...
1. Anogenital distance
· Genital opening to anus
· Distance relative to hormones pup was exposed to during development
· Males have a larger distance due to an increased testosterone exposure
2. Anogenital statistic
· Anogenital distance (mm) divided by weight (g)
· Can predict males and females
3. Rat reproductive system and environmental components on behavior
· 21 day gestation in the rat; 1st trimester is 7 days
· During 1st trimester, sexual differentiation is ambiguous, that is, the pups are bipotential for sex. Sex is set in the following trimesters.
· Environment effects the degree of maleness of femaleness in the pup. Neighboring fetal pups and hormonal exposure shape development. There is a position effect of hormones on growth and development within the uterine horn. The uterine horn holds the pups next to each other in a common placenta.
4. Rat sexual behavior
· Female proceptive behaviors – hopping and darting, travel and kick, ultrasonic singing and ear wiggling. The female typically initiates mating.
· Female receptive behaviors – lordosis (reflexive female mating posture - back arched down, rump up, and tail to the side, which physically rotates the vulva to a backward facing position), the stereotypical arching of the back in an inverted manner with head and hindquarters elevated.
· Male pre-copulatory behaviors – stereotypical grooming and washing, investigating female for chemical cues.
· Male copulatory behaviors – mounting (male's copulatory position), intromissions, and ejaculation. The value of intromissions is believed to be the stimulation of egg release.
· Post-ejaculatory interval – the refractory interval following copulation. This period of rest or inactivity after ejaculation is displayed by both sexes. In the male, it lasts 5 – 10 minutes. In the female, it lasts 30 seconds – 1 minute. This
· Male rats have a tonic hormone secretion, which stays fairly constant. Female rats have a cyclic hormone secretion. She will mate at the peak of the hormone curve or estrus. The estrus cycle is 4 days in length.
References:
http://www.spflrc.org/user/rats/Glossary.htm
http://www.spflrc.org/user/rats/norway_rat_ethogram.htm
Lange, Gary. Ethology Lecture. Saginaw Valley State University.
This is just a few more notes on some of the things rats love to do with regard to behavior.
One such thing is caching or stashing. This is most often done with food items. The rat will collect items of food, and run to deposit them somewhere else. The cycle is often repeated many times. Usually, food is hidden in a select location for that particular rat, with corners, nestboxes, and protected locations being most common. This behavior can sometimes be seen in nesting as well, with the rat dragging any soft or preferred nesting material into their sleeping areas. Female rats tend to do this more often than males. The reason why this stashing occurs is thought to be an adaptive trait for rats that would need to secure food for later use in times where food may not be as readily available.
Another item worth mentioning is digging. Rats do not burrow like some animals, but still seem to have a blast digging holes and pulling handfuls of dirt this way and that.
One of the most important things a rat does is sleep, typically doing so for upwards of 15 hours a day. Rats are considered crepuscular, and are most active and dawn and dusk hours. Rat positions can vary just as much as the rat themselves can, and depends on temperature, location, substrate, social situations, etc. Some prefer sleeping alone, some in groups, some in enclosed areas, and some out in the open. It all depends on the individual rat and environment.
A couple other notes on things I've seen and find interesting are these: the flank mark and tonic immobility. Flank marking is a way to scent mark but uses the flank rather than facial or genital secretions. The flank is rubbed against objects, and the rat typically leans sideways on a vertical structure, pushing the body sideways against that object while stepping forward. It is done in familiar environments, as urine marking is done more often in new environments as well. Tonic immobility is interesting as well, and occurs as a freezing behavior when the rat has pressure applied to certain areas like the upper back or nape. It can be seen when holding a rat with pressure on these areas, but is also the explanation for the immobility when a rat is on its back, having contact pressure on this area from the floor. The immobility tends to last longer in less dominant rats, interestingly.
http://www.spflrc.org/user/rats/Glossary.htm
http://www.spflrc.org/user/rats/norway_rat_ethogram.htm
Bruxing is a fascinating thing that rats do. The sound that you hear is from the repetitive grinding of the incisors against one another. This not only sharpens and maintains the length the teeth, but also seems to be done in times of relaxation and in times of stress. This is often accompanied by the justly named, eye-boggle. The eyeball literally vibrates in and out of the socket as the masseter muscle below it is moving. During bruxing, this muscle, which passes beneath the eye, causes the jaw to move up and down. These contractions can also vibrate the eye at the same time, and is most often associated with contentment and pleasure.
The process used to brux is much different than when a rat gnaws or chews, though, involving different muscles and tooth placement. The three jaw muscles used for chewing and gnawing are the masseter, but also the temporal and pterygoid as well. When a rat gnaws, its bottom jaw is jutted forward so the incisors line up and the molars are no longer together in a chewing position. The ability to move the jaw forward when gnawing gives the tooth a beveled edge, which is why they are so sharp. The additional iron compound in the teeth, giving them the orange appearance, also keeps them strong and sharp. Rat's teeth and rootless and grow continuously, so it is important to their overall health that their teeth also be healthy. Different from gnawing, when a rat chews, the molars are aligned to grind food and the incisors are no longer lined up.
http://www.spflrc.org/user/rats/Glossary.htm
http://www.spflrc.org/user/rats/norway_rat_ethogram.htm