Fireflies
Fireflies were rare in Berk. Actually, anything pretty was usually a scarce sight. That night though, there were hundreds. And Toothless was fascinated.
The glowing orbs would dart about, and the dragon's eyes would follow, wide as a puppy's. They were full of wonder as the little bugs flew around his head like sparks from a fire. Focusing on a single light as it swerved in a drunken line toward his nose, they soon crossed as the firefly alighted on the snout of the deadly Night Fury. He stood still for a moment, holding his breath as if waiting for something extraordinary to happen. It didn't. The little orb took flight again and joined its brothers and sisters in the large group overtaking the outskirts of the village.
The dragon's eyes narrowed to slits. He crouched down low, using his black scales to camouflage himself in the darkness. The cloud of fireflies moved back toward Toothless, and his muscles tensed. In a split second he had leapt into the swirling mass of lights with a mighty snap of his jaws and landed gracefully on the other side. He turned to face the curious humans who had been watching him from nearby and gave them a toothless smile.
"Let's see how long it takes him to realize that fireflies taste bad," the boy said.
As if on cue, the dragon's face twisted in disgust. He crinkled his nose and spat out a glob of glowing goo. Upset and embarrassed, he turned and let out a roar at the bugs. As if to mock him, the unaffected fireflies swarmed about his head.