I think this question might have been asked before, but I cannot locate it; but in sections for refreshing vocabulary and grammar, this sentence appears:
"Ein Vogel sitzt auf dem Elefanten.
I thought "Elefanten" is plural, so should the question be stated as:
"En Vogel sitzt auf dem Elefant"
If not, please explain.
Elefant is one of an irregular set of nouns that change their ending depending on what case they are in. When Elefant is in a case other than the nominative (as here in the dative), it will the ending -en. It also has this ending in the plural. Have a look at this link: http://www.vistawide.com/german/grammar/german_nouns03.htm