One thing I need to ask is how do you define dangerous? After all, even a normally docile milk cow can get very aggressive if she thinks her calf is being threatened. Now if you intend your definition to only include those animals that are normally aggressive without much provocation then the answer is yes, there are dangerous exotics here in Texas. Several ranches offer hunts for the various buffalo (cape, riverine, swamp or water). As Greybeard mentioned, under the right circumstances the oryx species have been know to attack a hunter while trying to make good their escape. Also I have heard of several of the deer species being aggressive. Last July I witnessed a red stag attack a hunter who had shot his buddy. As the hunter approached his kill the remaining red stag drove him off and stood guard over his buddys body until 5 of us finally drove him off. Just remember that any wild animal is just that, wild and unpredictable so we can never really know how they will react to in a given situation.
