Another argument in favor of Orcs and Hobbits sharing a common ancestor might be the fact that Frodo and Sam were able to disguise themselves as Orcs......and get away with it . Leaving aside the fact that they Sam has little or no difficulty in Cirith Ungol finding orkish garments that will fit Frodo and himself (which seems to indicate that hobbit sized orcs are fairly common). The addion of those clothes is enough to let them pass for orcs well enough to fool other orcs cursory examination, up fairly close. Even factoring in the fact that the Orc that drove them back into the marching column was likey in a hurry (hereafter referred to as the OS (Orc Sargeant) as I don't remember if he had a name) and the possibility that he only saw them from the back, the fact that they were not immediately recongnized as not being orcs desite the fact they aren't wearing masks (Sam I think actually says that a mask might help frodo pass for an orc I think, which seems to indicate that orcish armor does not unusally come with face plates on the helmets or cloth covers worn on the face, or it would have been a non-issue) seems to indicate that orcs and hobbits are cursorarily similar in appearance, similar enough to fool an Orcish officer (who presumaby has a degree of perception somewhat higher than the rank an file orc as otherwise he would not likey be in a position of command, or at least would not stay there.)
As for the questiuon posed earlier with regards to Orcish lifespan, that's a little hard to determine, since the real measure would require something that the other races of ME likey would never see, a non-slave non-combat orc, and orc with a life of ease and peace and who dies of old age. Orc might in fact have very long natural lifespans, but because of their extremely agressive and violent natures, few if any get to the end of thier actual lifespan. Think of it like, say a parrot which lives maybe 5-6 years on average in the wild, but in captivity can live almost as long as a person.
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