Popular caged pets, many Nanday parakeets were released or escaped from captivity and established large feral populations in ...

Budgies are easy to distinguish between the sexes because the area above a male’s beak is blue, and the female’s is brown ... Not to mention that they love foraging on the insects and seeds found in ...

Green is the quintessential colour of nature - of parks, gardens and forests, and a reminder of the life-giving power of plants. For animals, it's a complicated colour to produce using pigments. Many ...

Are you confident that the sky is blue and grass is green? What about everything in between? A viral test asking people to pin down the line where blue ends and green begins is showing that we ...