Hand signals

Hand signals are a way to comunicate and order dragons. It was first introduced in the 15th episode of Dragons: Riders of Berk, twinsanity, by Fishlegs. He ordered Meatlug to catch Ruffnut and Tuffnut from a falling branch. Later Hiccup inquired what he did,

Hand signals
Here are some of the known hand signals performed on dragons:

Toothless the night fury. plasma blast, smile, attack

Meatlug the gronckle. hug, catch

Hookfang the monsrous nightmare. annihilate

Stormfly the deadly natter. spine shoot, (and breath fire)

Barf and Belch the hideous zippleback. gas, ignite

Trivia
feel free to add or change anything :)