An investigation on the abundance and spreading of sqiurrel in the 5 areas (Verkiai forest, Karoliniškės forest, Vingis park forest, Kalnai park forest and Šeškinės Ozo forest) was carried out in 2003 – 2004 year. There were theese main forests: fir – grove, pinewood, mixed forest, broad - leaved forest and place overgrown with bushes. At investigation of first year (2003), were found that the highest number of sqiurrel footmarks was in Vingis park forest and Kalnai park forest, the less footmarks was in Šeškinės Ozo forest and Karoliniškės forest. At investigation of second year (2004) were found that the most footmarks of this animal was in Kalnai park forest, the less footmarks was in Vingis park forest. This diference in abundance of sqiurrel footmarks may be decided of fire tree and pine crop. It was found out, that the most abundance of sqiurrel was in fir – grove, there are a fundamental food – fir tree seeds, the less abundance was in the broad – leaved forest and in the place overgrown with bushes. During an investigation it was found that in Vilnius city forests more important for sqiurrel abundance was the source of nutrishion of them than the influence with marten.