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Native red  and American grey squirrels in English deciduous woodland

Comparative Table

 

 

Red

Grey

 

 

 

 

Av. Weight

grams

300

530

Population density

per Ha

1.4

8.0

Total body weight

grams per Ha

420

4,240

Ratio (bodyweight)

 

1

10

Calorific requirement

each animal-kJ/year

147,000 (i)

191,000 (ii)

Calorific requirement

per Hectare

205,800

1,528,000

Ratio (calories)

 

1

7

Litters

p.a.

2

2

Litter size

young

3

3

UK population in 1998 estimated (iii)

 

140,000

2.5 million

 

 

 

 

Notes:

 

 

 

(i) Gurnell 1987

142,026

 

 

   Gronwall 1982

152,716

 

 

 

 

 

 

(ii) Ludwick 1969

209,218

 

 

   Montgomery 1975

173,309

 

 

 

 

 

 

(iii) During the six years since 1998, the grey figure will have grown and the red fallen.