Well, apparently that kind of thing can happen in real life, as evidenced by my rams, Magnus and Cardigan.
Were I to relate Magnus and Cardigan to Arnold and Danny, Magnus is definitely an Arnold.
And poor Cardigan is a Danny.
Though they are twin brothers--born from the same mother at the same time and everything--there was always something never really right about Cardigan. He was a runt, much smaller than Magnus and his horns didn't grow at the right angle. You can see below how, instead of coiling up and around the outside of his head, they kind of look deflated and curl right back into his neck.
I think of all the animals we've had here--horses, chickens, ducks, sheep and cats--the sheep are on the lower end of the maintenance spectrum. They eat relatively little for their size because, being ruminants, they are efficient digesters, and after we indulged in a pair of electric shears, their bi-annual haircuts take less than an hour. Though the boys are different in everything from looks to personality, they've been a lot of fun for us and our girls.