This is a very beautiful engraving of a bird that could be a young emu. This carving shows internal details of lines and spots.

Bird

Nearby on a sloping surface is this large eel. This image was taken in natural light (no flash) and the eel may be difficult to discern. The head is to the right.

Eel

This image shows two decorated eels laying side by side. The each have four lines inscribed across the body.

Eels

Small shape