Kangaroos are iconic Australian animals who have long been used as a symbol within the country to represent moving forward. All four species are herbivores who roam around grazing on grass and leaves.

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The question of what defines a species has vexed scientists across the ages, particularly in conservation, where decisions require a firm understanding of biodiversity. When you purchase through links ...

The idea of a species is fundamental to the way that many people understand the structure of life on Earth. But ask 10 specialists how they define the concept and you might get 10 answers. In this ...