The most difficult terms in foreign language, in my experience, are names of animals and plants. You usually know some common ones but for me, there are a lot where I have no idea what are their names in English.
I just learned, from the Raidraptor archetype being added to #YuGiOhDuelLinks, that Lanius and Strix are actual bird species / categories, and which ones.
@yellowjitsch
They're part of the Latin scientific names.
A lot of flowers are known by their Latin names too.