All listened and heard a loud barking, coming from the neighborhood of the water.
"I think it's a fox!" cried Giant. "You'll remember, they bark just like that!"
"Let's try to get a photo and a shot!" answered the doctor's son.
"Nothing like getting pictures of everything," he added.
They increased their speed, and soon found themselves within a hundred yards of the shore of Firefly Lake. The barking had now ceased, and they stood still, not knowing in which direction to turn.
"Something moving over yonder," whispered Giant presently, and nodded with his head down the lake shore.
Making no noise, they went forward again. They had to pass some bushes and rocks, and then came to a point where a spur of land jutted far out into Firefly Lake. It was a rocky and sandy spur, with scarcely any brushwood on it.
"There you are!" said Snap, and pointed to the extreme end of the spur. There, on the rocks, were two large foxes, their noses well in the air, gazing down the lake attentively.
"We've got them," murmured the doctor's son. "Come on, we'll take pictures first and then shoot them!"
He brought around his camera and the others did likewise. They had just snapped the shutters when the foxes turned, saw them, and set up a loud and angry barking and showed their teeth.
"They are coming for us!" yelled Giant, and he was right. Without hesitation, the foxes made several big leaps and came directly for the young hunters!