Deutan colour-vision defects comprise deuteranomaly (anomalous trichromatic colour vision) and the more severe and less common deuteranopia (dichromatic colour vision). Deuteranomaly occurs if a ...

Discover more about the many different types of birds found around the world with Cam and Sophie the barn owl from One Zoo Three. What are reptiles? Discover the cold-blooded world of reptiles with ...