There is a distinct difference between Old Blackfoot (also called High Blackfoot), the dialect spoken by many older speakers, and New Blackfoot (also called Modern Blackfoot), the dialect spoken by younger speakers. Among the Algonquian languages, Blackfoot is relatively divergent in phonology and lexicon. The language has a fairly small phoneme inventory, consisting of 11 basic consonants and three basic vowels that have contrastive length counterparts. Blackfoot is a pitch accent language. Blackfoot language has been declining in the number of native speakers and is classified as either a threatened or endangered language.