claim: Species distribution can be understood through factors such as glaciation.
evidence: Cheshmeh-ye Gav -LRB- چشمه گاو , also Romanized as Cheshmeh-ye Gav , Chashmeh Gav , and Chashmeh-i-Gav -RRB- is a village in Naharjan Rural District , Mud District , Sarbisheh County , South Khorasan Province , Iran .. Province. Provinces of Iran. South Khorasan. South Khorasan Province. County. Counties of Iran. Sarbisheh. Sarbisheh County. Mud. Mud District. Rural District. Rural Districts of Iran. Naharjan. Naharjan Rural District. Naharjan Rural District. Naharjan Rural District. Mud District. Mud District. Sarbisheh County. Sarbisheh County. South Khorasan Province. South Khorasan Province. Iran. Iran. At the 2006 census , its population was 47 , in 15 families .