Chris Packham

The development follows an Animal Rising investigation, which made claims of cruelty at 'RSPCA Assured' slaughterhouses in England and Scotland.

The 'Penguins at Christmas' exhibition showcases three of the world’s 18 species of penguin, which were taken by Chris on four separate trips to the Antarctic.

The call to action from celebrities, including Dame Judi Dench and Dame Emma Thompson, comes ahead of a demonstration taking place in London this weekend.