Cookie use on MRCVSonline
We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive all cookies.
If you would like to forward this story on to a friend, simply fill in the form below and click send.

Your friend's email:
Your email:
Your name:
 
 
Send Cancel

Study sheds light on why some grey squirrels are black
Black squirrels are the same species as grey squirrels, the only difference being their fur colour. 

Findings point to faulty pigment gene obtained from fox squirrels

Scientists at Anglia Ruskin University have shed new light on the origins of black squirrels.

Published in BMC Evolutionary Biology, the study found that the black fur is caused by the grey squirrel having a faulty pigment gene - a gene also found in the closely-related fox squirrel.

The fox squirrel, which is native to North America, also has black variants. Testing on grey and fox squirrels across the US and Canada revealed that other “signatures” on the mutated gene are more closely related to the fox squirrel.

Researchers say this suggests that the mutation first arose in the fox squirrel and was passed to the grey squirrel through interbreeding.

“Squirrels take part in ‘mating chases’ where a female squirrel is pursued by lots of male squirrels and eventually one male mates with the female,” explained study leader Dr Helen McRobie.

People have spotted ‘mixed species’ mating chases, with a mix of grey and fox squirrels pursuing a female. The most likely explanation for the black version of the gene being found in the grey squirrel is that a male black fox squirrel mated with a female grey squirrel.”

She continued: “The fact black grey squirrels have become so common right across North America is possibly because black fur offers a thermal advantage, helping them inhabit regions with extremely cold winters. This may have contributed to the expansion of the grey squirrel’s range during the past 11,000 years, following the end of the most recent ice age, helping them spread further north into Canada.”

Black squirrels in the UK are believed to have escaped a private zoo after being imported from the US. They are the same species as grey squirrels, the only difference being their fur colour.

The first wild black squirrel was recorded in Woburn, Bedfordshire, in 1912. Today, they can be found across much of south-east England.  

Become a member or log in to add this story to your CPD history

New York to ban sale of foie gras

News Story 1
 New York City councillors have voted overwhelmingly in favour of legislation that will see the ban of foie gras in the city. The move, which comes in response to animal cruelty concerns, will take effect in 2022.


 Councillor Carlina Rivera, who sponsored the legislation, told the New York Times that her bill “tackles the most inhumane process” in the commercial food industry. “This is one of the most violent practices, and it’s done for a purely luxury product,” she said.


 Foie gras is a food product made of the liver of a goose or duck that has been fattened, often by force-feeding. New York City is one of America’s largest markets for the product, with around 1,000 restaurants currently offering it on their menu. 

Click here for more...
News Shorts
UFAW Student Scholarships open for applications

Applications to the 2020 Animal Welfare Student Scholarships, run by the Universities Federation for Animal Welfare (UFAW), are now open.

The Student Scholarship scheme enables students to pursue their animal welfare interests and provides an opportunity to conduct relevant research projects. Students undertaking courses in the biological, psychological, agricultural, zoological or veterinary sciences are invited to apply. Applications are also open to students in other disciplines interested in conducting a project in animal welfare.

Further details about the scholarship and an application can be found on the UFAW website. The application form must be submitted to UFAW by 28 February 2020.