Turtles or Hurdles?

In each sentence, guess whether the blank traverses a "turtle" or a "hurdle."

1. "What a sight [those slow, lumbering snails] had been! Something like a slow ___."
—Patricia Highsmith, Eleven, 1989, p. 772.

2. "Interestingly, the animals would occasionally leap over the ___."
—Christopher Peterson, et al., Learned Helplessness, 1995, p. 193.

3. "He jumped over the ___. Then he turned and ran across the roof as fast as he could."
—Paul Andrew Witty, Reading for Interest, 1955, p .114

Answer: 1. hurdle, 2. hurdle, 3. turtle (The answer is in black text on the black background. Highlight it to view.)