Leung Lik-hang, 15, Pui Kiu College: I would change the colour of traffic lights. Red-green colour blindness is the most common type of colour deficiency in humans.

Some animals don’t stay the same shade! From survival tactics to communication, these wild creatures use colour shifts to ...

However, the punch didn't change the blue colour of Bowie's irises, it was the enlarged pupil that made his left eye look darker. It is, however, possible for injury to alter iris colour, says Mackey.

Through apparently spontaneous change or through mishap or illness, our eyes can change colour in surprising ways. The first pictures of the new-born baby that flashed up on our family chat showed ...

Scientists discover shark that changes colour like a chameleon - Study finds skin colour of blue shark grows darker when it swims deeper ...

The Snow Bunting’s colour change is both helpful and beautiful. 9 / 9. Scarlet Tanager. Scarlet Tanagers are bright red with black wings in summer, making them easy to spot in the forest.