Wolves are intelligent creatures -- in how they stalk their prey, in how they work together, and now, in how they harmonize. A pack of wolves strikes fear into many an animal, including humans, and the ability of wolves to create an illusion of a bigger pack gives proof of their ability to plan and execute a chase.
Wolves have incredible hunting instincts and survival skills, and this is yet another example of that. Wolves know that animals that are scared are more likely to make a mistake, so they do what they can to maximize that fear. I wouldn't say that wolves are simply "smarter" than we give them credit for, though, because there's a bunch of different types of intelligence.
Wolves are pack animals. Packs hunt together, and it requires coordination and planning to hunt as they do. One wolf is spotted by its prey, but other wolves attack the distracted prey from the other sides. Such actions suggest that they are capable of reasoning and organizing the pack to utilize each member's skills.
Wolves, and most likely, all animals are "smarter" than we humans think. If you would study what certain animals do to survive, you would see that their instincts are amazing. They instinctively know certain things that they need to know in order to survive. How do they know? Are they smarter than we think? Maybe not necessarily smarter, but they do have those instincts, and instincts can be interpreted as a kind of intelligence.