It occurred to me that it wouldn't have been an ordinary domestic sheep, since Avraham was out in the wilderness. Furthermore, as my friend Rabbi David Bar-Cohn pointed out, Avraham would presumably not have stolen someone's sheep! Thus, it would have been a wild variety of sheep - possibly the aoudad, but more likely the mouflon.
Mouflon shofars are not normally available; the one that is on display at The Biblical Museum of Natural History may be the only one in the world. It is spectacularly beautiful! There are no longer any wild mouflon in the Middle East; contemplating Avraham's ram reminds us that many wild animals which used to live in the Land of Israel no longer do so.
|A mouflon caught by its horns in a thicket. See this link.|