The Spanish word 'morsa' (meaning 'walrus') has an interesting journey through northern European languages. It comes from French 'morse', which in turn borrowed it from Finnish 'mursu'. The Finnish term is related to the Sami word 'morša', both meaning 'walrus'. Interestingly, these northern terms competed with the Old Norse word 'hrosshvalr' (literally meaning 'horse-whale'), showing how different cultures described this unique arctic marine mammal. The word made its way south through French before entering Spanish, bringing this northern creature's name to the Spanish language.

Unlike many Spanish words that have related simpler forms, 'morsa' stands relatively alone in Spanish vocabulary. This is because it's a borrowed word that came into Spanish through French rather than developing from Latin roots like most Spanish words.

While English uses the word 'walrus' instead of a form related to 'morsa', both English and Spanish borrowed their respective terms for this arctic animal from northern European languages. The English 'walrus' comes from Dutch 'walrus', which is related to Old Norse 'hrosshvalr', showing how both languages needed to borrow terms for this arctic animal that wasn't native to their speakers' regions.