Animal hackers: altered creatures star in London exhibition

Wellcome Collection shows transgenic goat and rat bred to prefer alcohol in exhibition exploring humans' perceptions of animals

What links an African clawed frog once used as a human pregnancy test, a transgenic goat bred to produce super-strong silk and a rat whose preference for booze may have helped Finnish alcoholics?

All three have gone on display at a new exhibition at London's Wellcome Collection alongside art works which include roadkill taxidermy and a film that tells the true story of a man who kept a pet tiger in his New York apartment.