"When I was 14 years old, a horse knocked my teeth out. I've had a huge amount of broken ribs and broken shoulders. I had my neck broke twice, and never missed a day's work," says RC.
Few others would choose to risk even more serious injury by living with a horned relic from the dinosaur age. Yet, RC never has shied away from being close to Wildthing. In the scorching heat of a Texas summer, the unlikely pair can be found swimming together in a nearby pond.
So how exactly did RC befriend the largest land animal in North America?
"I got him bluffed," he says. "And that's all there is to it. He's just bluffed. He doesn't attack me for two reasons. He thinks I'm tougher than he is, probably. But the bigger reason is that he loves me."
Love may just be the ace in the hole. Somehow, Wildthing knows to leave his wildness at the welcome mat.
"He's never been bad inside here," RC says. "Tears up everything outside and doesn't tear up anything in the house. One time, he picked up a couch and moved it. I told my wife she probably had it in the wrong place anyway! I would rather have him be in here than my kid most of the time."
Wildthing may be a well-behaved bull in a china shop, but RC knows that raising a bison as part of the family takes a special breed of human.
"Don't take a day off. It's seven days a week and it's three or four times a day," says RC. "I've never tried to make him a super gentle animal cause I enjoy him being wild. I want him safe for me, and I sure don't want him hurting anybody else. But I enjoy his wildness."
RC has enjoyed crossing nature's divide. And there is no returning after a lifetime of extraordinary and seemingly impossible feats.
"Matter of fact, I may be nuts and it may be exactly why I'm doing this!" says RC. "It's strange in your world, but it's not strange in mine 'cause I've lived with animals for 40 years."
When it comes to outrageous family members, Melanie Typaldos of Buda, Texas, understands that love comes in many sizes and species. She is the proud owner of Caplin, an unlikely entrant on the giant spectrum.
Caplin weighs more than 100 pounds, which may not seem noteworthy compared to a 2,100-pound bison, but is enormous when you hear what he is: a capybara.
"Capibaras are the world's largest rodents," says Typaldos.
CLICK HERE to see photos of Caplin
The top-recorded capybara weight is more than 230 pounds; a rodent that weighs as much as a man.
Capybaras are native to South America, which is where Typaldos first saw the super-sized cousin of the guinea pig on a family vacation. She found a breeder in the States and brought Caplin home when he was 11 days old.
"When I saw him, I just fell in love immediately," says Typaldos. "He sleeps with me every night. When the weather is cool, he likes to get under the covers. He doesn't snore."
And like Wildthing, Caplin has a gentleman's manners in the house.
"He's housebroken. Capybaras like to go to the bathroom in the water. So we just have a bowl of water that's in the bathroom right next to the toilet," says Typaldos.
As for diet, capybaras eat plants, leaves and grass. His teeth are long and razor-sharp, which Typaldos learned from painful experience. She is quick to point out that prospective owners should think very carefully before considering a capybara for a pet.