Day 7: Going pink

Day 7: although they seem to be in the more or less same instar now, one caterpillar is pinker than the other, which is more grey. The grey one is also larger.
When viewed from the left, they both seem to have the letter "C" on their cheek.

"C" for "Caterpillar" maybe? :D

Larger caterpillar

Smaller caterpillar

Smaller caterpillar

Larger caterpillar

Smaller caterpillar

They both seem pretty happy munching away on nettle leaves and pooping like little poop machines.