Aatsista-Mahkan

Aatsista-Mahkan or Running Rabbit (c. 1833 – probably 24 January 1911) was a chief of the Siksika First Nation. He was the son of Akamukai (Many Swans), chief of the Biters band, and following the death of his father in 1871, Aatsista-Mahkan took control of the band. He was known for his generosity and kindness, and for his loyal protection of his family.

In 1877 , he was a signatory to Treaty 7, but he and his people continued to follow the bison until 1881, when he and his people were designated to settle on a reserve, 60 miles east of today's Calgary, Alberta.

Running Rabbit was born into a prominent family. His older brother Many Swans, who took their father's name, was chief of Biters band of Siksikas to which they belonged. As a teenager and young warrior, Running Rabbit had not performed any great deeds worthy of recognition until his brother lent him an amulet said to have spiritual powers made from a mirror decorated with eagle feathers, ermine skins, and magpie feathers. Running Rabbit was successful during his first ever raid as a warrior, gaining himself two enemy horses which he captured and gifted to Many Swans. Similar success during following expeditions resulted in Many Swans giving Running Rabbit the amulet as a gift. Word of Running Rabbit's success spread throughout the Biters band and many referred to him as the "young chief" before he earned or was appointed any leadership position in the band.