two new rabbits

Question
I just adopted two (presumably) young (maybe) male calico rabbits.  They have been mounting each other and the mountee gets upset and chases the other one around and then vice versa...
When in their cage, they sometimes go nuts and run like madmen...They are let out eveyday, most of the day, but at night, they freak out. I have more questions too, but these are the most pressing.lol.   Thank you

Answer
Well, you don't actually ask a question per se... I'm assuming you're wondering whether this is normal behavior and maybe what to do about it? I'm not sure what you mean by "they freak out" at night. Mounting and whatnot?

Yes, it is normal for young rabbits of either sex to mount one another and race around as though they are out of their little minds!

Please check the sex of the animals if you don't know how old they are to ensure that they are indeed the same sex. If not, they could start reproducing if they are old enough. Females usually have to be about 4-5 months old, males younger (as soon as the testicles drop down into the scrotum).

To check for sure, here is the procedure recommended
by the San Diego House Rabbit Society:

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While seated, place the rabbit's feet on your chest. Hold the crown of the
rabbit's head in your hand and bend over from your waist and place the
rabbit's ears between your knees, with the rabbit reclining securely in
the wedge between your legs. With your index and middle finger, press
gently on either side of the vent (genital mound) area.

If the rabbit is a male, a tubular protrusion will be seen. Even easier,
if the male bunny is about 10 weeks old or older, testicles will be
noticed on either side of the genital mound. If the bunny is a female, the
protrusion will look more like a slit.
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Occasionally, having a rabbit on his back whose testicles have just
recently descended into the scrotum will cause the testicles to "fall up"
back into the body. But you should be able to notice the "bagginess" of
the scrotal sacs on either side of the vent.

If they are opposite sexes, please separate them immediately so you don't have any little surprises. I recommend having them spayed or neutered ASAP. Females should be at least 6 months old, males can be neutered as soon as the testicles appear. A good rabbit vet should be able to tell you if he or she thinks a female is developed enough for a spay.

Even if they are the same sex, they may as they grow more sexually mature begin to fight as their hormones drive them to be more aggressive and territorial. This is the dreaded "rabbit adolescence." You may have to separate two males or two females if they become too aggressive. This isn't necessarily permanent--you can have them spayed or neutered, then wait during a "hormone washout" period, then follow the procedures for re-introducing them found at http://www.rabbit.org/faq/sections/introductions.html

If you have not taken your bunnies to the vet before, please try to find one who is experienced with rabbits. Many vets who are very good with dogs and cats are not knowledgeable about rabbits, especially the latest information. The page http://www.rabbit.org/faq/sections/vet.html has suggestions on how to find
one. There is a list of some vets at http://www.rabbit.org/care/vets.html and another organization's list at http://homepage.mac.com/mattocks/morfz/PB_vets.html

You can also contact a nearby House Rabbit Society chapter or other rabbit group for suggestions on good local vets. HRS has a page listing contacts for their own chapters. If there is not one near you, you can look for a nearby independent group using the HRS contacts page http://www.rabbit.org/links/index.html
In general, I highly recommend the House Rabbit Society
Website as a resource for care, behavior, diet, health and other issues
for any pet rabbit. It's at http://www.rabbit.org

More info on spaying and neutering, including the risks and benefits, can be found at http://www.rabbit.org/faq/sections/spay-neuter.html

Best of luck to you and your new companions!

Gina