A wallow is a basically a mud hole, usually in or around a mountain spring, that bulls "wallow" or role around in.
I've located a lot of wallows while hunting and scounting, and I always seem to find bulls in those areas, but I've yet to ever actually SEE a bull in the act of wallowing. I think it would be a cool thing to see.
Here in Arizona, they start about August, but I have seen them earlier. If you can find one in summer, try to keep it a secret. I have seen them stop using busy one's right when the hunters start snooping around.
One of the most important pieces of equipment that you will take hunting is a good quality pair of optics and they take some care to give you the performance that you want. So here are a few tips.
Use some alcohol and cheese cloth to clean the lenses. I will usually pick up an extra cleaning kit from my optician when I have my eyes examined.
Don't touch the lens with your fingers. If there is a stick or a bug on them blow it off.
Use the lens covers. They are there...