The line between species can become permeable

What separates two species? Sometimes the answer is simple, but sometimes the lines are blurred.

That's what's happening in this image of a tiger and cheetah, by Spanish artist Jaume Montserrat, whose series "Empty Land" is a set of illustrations where the boundaries between two species are not quite what they seem. See more of his work on his website.

The line between species can become permeable