|26 April 2015||12:30 - 13:00, 14:30|
Blackbirds are black (the females, brown) and that's how they should be. A white blackbird, well that's just wrong - but they do occur from time to time. Although we know about feather pigmentation and how mutations can change a bird's colour, there are aberrations - deviations from the norm - of which the real cause remains unclear. In co-operation with the British Trust for Ornithology (BTO), bird curator Hein van Grouw explores these mysteries in an attempt to explain them.