Which group of animals that their males have a bone in their Penni? (penis with oss penis).?

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It's a widespread trait among different lineages of mammals. For example, it's fairly common among primates. (A nearly fifty million year old fossil one from Messel was sexed due to precisely this detail.) That won't help too much, as it happens to be unnamed. You also may have noticed, from your own activities, that this doesn't apply for all primate males. Some of us achieve rampant solidity without such scaffolding.

Rodents come readily to mind but, despite what the linked page appears to maintain, I don't think it's true of all groups. The author claims (not necessarily entirely correctly in my opinion): "Like some other mammal taxa, but unlike rabbits and other lagomorphs, male rodents have a baculum (penis bone)."

Still, that's Berkeley University for you. It's one of their webpages. Actually, they tend to be fairly good....Show more

The os penis or baculum is found in most carnivores (not cats) and is largest, so far as I know, in the walrus. The baculum of a raccoon is sigmoid and just the right size for one zoologist to use as swizzle sticks in his old fashioned glasses. Most primates have them. Man is singularly deprived in this regard. Rodents have them. The bone is found only in mammals....Show more

The baculum can be found in the egg laying (amniotic) groups: turtles, squamates (scaled reptiles), mammals, bats, and Archosaurs that became birds. The structures are very similar in function but arise at different developmental points in embryogenesis indicating it evolved independently in these families. http://pharyngula.org/index/weblog/comments/penis_evolution/
http://icb.oxfordjournals.org/cgi/content/full/42/2/216
http://209.85.173.104/search?q=cache:K5TUC55Z3_8J:www.personal.uni-jena.de/~b6biol2/goto.php%3Fw%3D/Publications/Bacula.pdf+baculum+phylogeny&hl=en&ct=clnk&cd=3&gl=us&client=safari
http://cres.sandiegozoo.org/projects/pd_significance_baculum.html...Show more

Carnivorous mammals.

Mammal, dog penis
http://search.yahoo.com/search;_ylt=A0geu6_cjc1HqUAAiDRXNyoA?p=dog+penis+bone&fr=b1ie7&ei=UTF-8&rd=pref...Show more