ox の複数形は oxen

child の複数形が children はよく知られているが ox の複数形が oxen であることはあまり知られていない、、、かもしれない。0:19 it's late summer now. the muskoxen shed their warm woolly under-layer.

A Muskox Face-Off | Polar World

https://www.youtube.com/watch?v=juI7ZJxa9tY  22:43 our ancestors were obviously impressed by the strength of oxen.
The Most Extreme - Strength

https://www.youtube.com/watch?v=UmpWgiifV1U  8:46 festively decorated oxen plod through the paddies to break up the soil for plant. 花牛は田んぼに入り代掻（しろか）きをする。
[Begin Japanology] Season 6 EP10 : Wagyu 2013-03-21j