Night Swarm

Night Swarms are an albino subspecies of Night Terrors that live in caves and are afraid of light.

Official Description
"These poor sighted Night Terrors are afraid of the light and use sound waves to maneuver themselves around their cavern home."

Physical Appearance
Like an Alpha Night Terror, the Night Swarms are white in color. They appear to have black edges on wings and tail in Rise of Berk so they can be differentiated from the other Night Terrors.

Behaviour and Personality
Unlike the normal Noght Terrors, the Night Swarms are very aggresive towards humans. They are afraid of light and become disoriented from high sounds.

Trivia

 * They appear to choose a leader instead of having one born like that.