field and laboratory investigation on the ecology,reproduction and behavior of spermophilus citellus and spermophilus xantophrymnus were performed over a period of 4 years. both S.citellus and S.xanthophrymnus are diual species and occupy semiarid steppe areas in turkish Thrace and Anatolia,respectively.Distribution of the former species is confined to restricted steppe areas in turkish thrace whilethe,latter lives on the Anatolian steppe,and is sympatric whit Meriones tristami,Mesocricetus brandthi ,Allactaga williamsi and Microtus spp.The burrows of both species have one entrance,and are built separately in the field.They constitute smal social colonies and communicate with each other by emitting hoarse,sharp and shrill sounds. S.xantophrymnus enterrs hibeation in August and emerges in february.it was observed that they were tolerant of each other.Based on field and laboratory studies S.citellus and S.xantophrymnus give birth once a year .the little size was at 3 for the former species,and1-4 for the latter.average weight at birth was 5 g for both species. Newbos of both species became hairy at 15-17 days,their eyes opened at 22-25 days , and their ears at 30 days and offspring were weaned at the end second month  after birth .The exteal characters of 2babies from Edrine attaned those of adults4months after birth.