Categories David Comma butterfly caterpillar on a railing Post author By David Post date 22 June 2018 Caterpillar crawling along the top of the handrail of the bridge at Compton Park pool. If it grows up, it will become a comma butterfly. The head is at the orange end. ← Southern hawker dragonfly ovipositing, Baggeridge Country Park → Watchful heron on fallen tree, West Park