Take a close look at the controversial Green “Man” on the official invitation to Charlie III's upcoming coronation—the one that has occasioned so much brujaja in the British press.
Note, gentle reader, that it is not in fact a Green Man at all, but rather a Green Cat.
Green Beasts
In fact, the Green Feline is a not infrequent variant in the Leaf Mask motif, which turns up, historically speaking, relatively early in the development of the motif: during the early Romanesque period, in fact.
You can generally distinguish them from Green Men by their cleft lips, and the pointed ears on the tops of their heads. Art historian Tina Negus, attempting accommodation, refers to them as Green Beasts rather than Green Cats, but in fact almost all known examples are readily identifiable as felines rather than some other sort of beast.
So: if you're going to have a Green Beast, why a cat rather than some other sort of animal?
Myself, I suspect two reasons: one historical, one, well...what Nanny Ogg would call persychological.
Cats or Lions?
First off...which are we actually seeing here: Green Lions or Green Cats?
Um...Reply hazy, try again later.
For the time being, let's go with the neutral term, Green Felines. Later on, we'll see why the royal Lion would be the preferable reading.
Practical Cats
To this question, my friend and colleague Frebur Moore suggested a practical answer: that—felines being predators—what we see in the Green Feline is the hidden, stalking beast, peering, as it were, through foliage.
Makes sense. But wait, there's more.
Eyes Front
It's clear that the first foliate masks were human faces. This, I suspect, is yet another reason why Green Beasts tend to be Green Felines.
Felines, being predators, have their eyes on the front of their heads rather than on the sides. This makes their faces more visually similar to human faces and hence, more readily adaptable as stand-ins for the human face than those of animals—herbivores, say—with eyes to the sides of the head instead.
Yet another reason why cats are better than dogs.
But the Real Reason...