system
Given the following post, respond as if you're commenting on Reddit:
human
[LOTR] Are the Uruk Hai different from any other orcs? Are they the same species?

Just asking cause they look so much much larger and more uniform than the armies of Mordor.
gpt
There are many different regional variants of orc of varying size, strength, and resistance to sunlight. The term "uruk" (the "-hai" suffix just means "folk") is a blanket term for the highly elite types of orc which began appearing in the late Third Age and which excelled in each of these attributes, at least by orc standards. At first they were seen exclusively in the service of Sauron, though they never supplanted the ordinary orcs as the rank-and-file of Mordor. After his betrayal Saruman evidently managed to breed his own version of uruks with a slightly different appearance than the Mordor elites.