"Look there!" he exclaimed, pointing down at the ground. "A human
track."
The boys looked and saw the imprint of a foot!
Yet, on inspection, it was unlike a human foot and seemed more like
the track of a bear. Several other prints of a similar nature became
visible now that they examined the spongy soil carefully.
"Whatever do you think it is?" Frank asked of the professor, who was
examining the imprints with some care.
"I don't know, my dear boy," he replied. "It looks like the foot of a
bear, and yet it appears to be webbed as if it might be that of some
huge water animal."
"Yes, but look at the size of it," argued Billy. "Why, the animal
whose foot that is must be an immense creature."
"It's certainly strange," mused the professor, "and suggests to me
that we had better be getting back to our aeroplane."
"You think it is dangerous to remain here, then?" asked Harry, with
some dismay.
"I do, yes," was the naturalist's prompt reply. "I do not know what
manner of animal it can be that left that track, and I know the tracks
of every known species of mammal.
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