According to VS Bazhanov (1948 6), during the rut on adult female, with two or three adult males, and at last year's records and males exhibiting sexual desire, the ratio is 1: 6-7. However, this ratio sex should not be taken as true, because during the rut males in search of females are highly active and mobile, so in this period of the catch they always take precedence over females. Ratio sex adult squirrels undergo sharp fluctuations during the spring-summer season, and is closely related to the physiological characteristics of the animals and their mobility.
Within Kazakhstan adult squirrels, according to the observations of different years, was a slight predominance of females (58%) of males (42%). In May, there are individuals of different sex in the catch at about the same amounts, it is likely that ratio Equality (1: 1) at this time close to exist. In the future, according to the results of capture, the predominance of females over males is very sharp, and the second half of June, when the overwhelming majority of males are in hibernation, the catch occur exclusively female.
View more profit wort (400 individuals) shows that ratio Floor them close to 1:1 — 51.4% of females "males 48.6%. Similar figures leads VS Bazhanov (1948 b) for the Orenburg region — 55% and 45% respectively. Apparently, these values are close to existing in nature.
The age structure of adult squirrels characterized by the following averages (in%): Yearling (have spent a hibernation) — 62 year-olds — 24.4, three years old — 7.3 chetyrehletok and older — 6.3. In the dynamics of the number of gophers first two age groups have a leading role, as in the population (depending on the habitat and different years), they range from 74 to 94%. The role of the older age groups to replenish herds insignificant — to three and four years of age reached by many individuals.
In the floodplain. Ural life animals much more — here yearlings make up about 40%. However, the borders of the area (south of the Urals) animals one year of age is dominated (80% of the population).