zoological specimen
Refers to a preserved animal specimen used for scientific study, display, or collection. Typically a taxidermied animal, skeleton, or preserved body.
I saw a rare zoological specimen at the museum.
植物標本 is a botanical specimen (plant), while 動物標本 is specifically a zoological specimen (animal).
剥製 refers specifically to a taxidermied animal, a common type of 動物標本.
Compound of 動物 (animal) and 標本 (specimen).