Squirrels are members of the rodent order and are distributed on virtually every continent. The squirrel family (Sciuridae) is composed of some 285 species globally. Britain is home to two species: the Eurasian red squirrel (Sciurus vulgaris), which is widely considered the native tree squirrel species here, and the eastern grey squirrel (Sciurus carolinensis), which was imported from the United States of America in the late 1800s.
A tree-dwelling rodent native to North America, Grey squirrels were introduced to Britain in the 1870s and have increased in range and number significantly since.
Generally speaking, feeding appropriate food in appropriate quantities is fine. There can, however, be some unforeseen consequences to supplementary feeding.
Grey squirrels are considered invasive in Britain and rescue centres can only be released under a license from Natural England.
Caching is innate for squirrels and their caching behaviour is affected by the environment and potential thieves. They have a good spatial memory that allows recovery of upto 95% of cached nuts.
First confirmed in Britain in the 1980s, squirrel pox is an often fatal viral disease affecting Red squirrels.
The first Grey was introduced to Britain in 1876 and, since then, successive introductions have seen the population become established across much of the UK.
Genetic diversity among squirrels results in, sometimes extreme, variations in the deposition of the pigment melanin in fur as it grows, resulting in black, white and grey animals. They are all the same species, however.
A combination of habitat loss, out-competition by Greys and the spread of an often fatal virus are all factors in the Red's decline. A broad-scale approach to managing Greys and forests is needed to address the decline.
Belinda, The Forest How Red Squirrel - by Peter Trimming
The Book Guild -- 2016 -- ISBN: 978-1910878552
Charlie Brown - by Mike Towler
Vulpine Publishing -- 1987 -- ISBN: N/A
Red Squirrels - by Helen Butler
Wight Squirrel Project -- 1998 -- ISBN: 978-0955231438
Red Squirrels: Ecology, Conservation & Management in Europe - by Craig Shuttleworth, Peter Lurz & Matthew Hayward
European Squirrel Initiative -- 2015 -- ISBN: 978-0954757618
Squirrel on my Shoulder - by John Paling
BBC Books -- 1979 -- ISBN: 978-0563176398
Squirrels - by Jessica Holm
Whittet Books -- 1987 -- ISBN: 978-1873580172
Squirrels - by Monica Shorten
Collins -- 1954 -- ISBN: 978-1616905774
Squirrels in Britain - by Keith Laidler
David & Charles -- 1980 -- ISBN: 978-0715378250
Squirrels in Your Garden - by Doreen King
Kingdom Books -- 1998 -- ISBN: 978-1852790288
The Conservation of Red Squirrels - by John Gurnell & Peter Lurz (eds)
PTES -- 1997 -- ISBN: 978-1855800144
The Eurasian Red Squirrel - by Stefan Bosch & Peter Lurz
Westarp Wissenschaften -- 2012 -- ISBN: 978-3894322588
The Grey Squirrel: Ecology & Management of an Invasive Species in Europe - by Craig Shuttleworth, Peter Lurz & John Gurnell (eds.)
European Squirrel Initiative -- 2016 -- ISBN: 978-0954757649
The Natural History of Squirrels - by John Gurnell
Christopher Helm Publishers -- 1987 -- ISBN: 978-0747012108
The Red Squirrel - by Jessica Holm
Shire Natural History -- 1989 -- ISBN: 978-0747800224
The Red Squirrel: Redressing the Wrong - by Charles Dutton
European Squirrel Initiative -- 2004 -- ISBN: N/A
- English Country Garden
- Penrith & District Red Squirrel Group
- Red Squirrel Survival Trust
- Red Squirrel Trust – Wales
- Red Squirrels of The Highlands
- Ron Bury’s Wildlife
- Save Our Squirrels
- Saving Scotland’s Red Squirrels
- Squirrel Refuge
- Westmorland Red Squirrels
- Wight Squirrel Project