A battle of wits? Problem-solving abilities in invasive eastern grey squirrels and native Eurasian red squirrels

Competition between Eurasian red and introduced Eastern grey squirrels: the energetic significance of body-mass differences.

Daily energy expenditure (DEE) was measured in sympatric populations of red and grey squirrels using the doubly labelled water technique. Grey squirrels had significantly higher DEEs than red squirrels. However, the difference between the species was not separable from the effects of body mass on DEE. The DEEs of both species were in accordance with published allometric predictions incorporatin...

eastern grey squirrels and eastern fox squirrels have succeeded in invading urban areas ? By :

Coccidian parasites of red squirrels (Sciurus vulgaris) and grey squirrels (Sciurus carolinensis) in England

Coccidian parasites of red squirrels (Sciurus vulgaris) and grey squirrels (Sciurus carolinensis) in England S.J. Ball, P. Daszak, A.W. Sainsbury & K.R. Snow To cite this article: S.J. Ball, P. Daszak, A.W. Sainsbury & K.R. Snow (2014) Coccidian parasites of red squirrels (Sciurus vulgaris) and grey squirrels (Sciurus carolinensis) in England, Journal of Natural History, 48:19-20, 1225-1230, DO...

Alien species and interspecific competition: effects of introduced eastern grey squirrels on red squirrel population dynamics

1. Throughout much of Britain, Ireland and north Italy, red squirrels ( Sciurus vulgaris L.) have been replaced by alien grey squirrels ( S. carolinensis Gmelin) introduced from North America. We have studied squirrels in two mixed woodlands in north Italy and two conifer forests in north England. In each country, one site was occupied by red squirrels and one site by both species. 2. We have p...

Does behavioral flexability and tolorance to disturbance explain why eastern grey squirrels and eastern fox squirrels have succeded in invading urban areas?