The pygmy/dwarf hippopotamus is one small animal

[angliholic]

The pygmy/dwarf hippopotamus is one small animal that is suffering from the environmental changes.



Do both pygmy and dwarf fit in the above sample and mean about the same? If not, when should I use one and when the other? Thanks.

[Anglika]

It is presumably the name of the specific creature found in West Africa, so "pygmy" is the word you need.

It is refers to non-specific very small hippopotami, you can use either.

[angliholic]

Thanks, Anglika.

Got it!