What are the tentacles of a butterfly?

The antenna of butterfly head is rod or hammer.

Appearance characteristics: the butterfly body is mostly between 5cm- 10cm, which is divided into head, chest and abdomen; Two pairs of wings; Three feet. There are a pair of hammer-shaped antennae on the head, with thick ends and wide wings, which stand on the back when resting. Butterfly antenna is rod-shaped, and each node at the end of the antenna is thick and hammer-shaped. The body and wings are flattened by scaly hairs. Bristle-like: very short, the base of 1-2 node is relatively thick, and the whip is as slender as mane, such as cicada, planthopper and dragonfly.