Boiga barnesii — Barnes’s Cat Snake
This adorable baby snake was already practicing its "fear me, I am ferocious" position though it couldn't have been more than 8 inches long. Also, it hadn't yet learned that striking repeatedly makes a snake seem more scary; it just held this semi-coiled position stiffly.
This adult mostly just coiled up also. Maybe this species is all about the bluff.
- de Silva, A., Ukuwela, K. 2017. A Naturalist's Guide to the Reptiles of Sri Lanka