Different animals' milk contains more sugar than others. I have read that the Huns drank fermented horse milk, but what are the types of milk that are fermented around the world today?
The many varieties of fermented milks from around the world which are distinguished by the type and specificity of the microorganisms used for fermentation, by preserving fresh animal milk (e.g. cow, goat, sheep, mare, buffalo, camel or yak).
Dahi from India is a type of set yoghurt made from cow or buffalo milks which contains bacteria like L.lactis subsp. lactis, S. salivarius subsp. thermophilus.
Langfil is a traditional fermented milk product from Sweden, It is made by fermenting cow's milk with a variety of bacteria from the species Lactococcus lactis and Leuconostoc mesenteroides.
Gariss is an indigenous fermented milk of Sudan. The product is made from camel's milk by natural fermentation of milk in leather bags. Streptococcus infantarius subsp. infantarius are involved in fermentation.
Yakult, mixture of skimmed milk with a special strain of the bacterium Lactobacillus casei Shirota. It was created by Japanese scientist Minoru Shirota.
Camel's milk is fermented in many places. Here and here is some info for you. Ewan McGregor and Charlie Boreman drank it in Mongolia during the filming of The Long Way Round. It was warmed over a stove that was fueled by camel dung, which apparently gave it an 'earthy' taste.
In Kazakhstan it’s known as 'Shubat' - and you can buy it in the supermarkets.
Known as Kefir, milk is fermented using grains - which produces what some say is a superior product to yogurt.