Wrong whales have been extinct for millennia. Wrong whales had a habit of going into shallow water to scoop up large schools of fish. It was a strategy that worked well for them for eons.
However, nature abhors a vacuum, land based predators developed to take advantage of the wrong whales feeding habits. That's why in fossil beds today we often find the remains of wrong whales impaled on the tusks of mammoths and mastodons. The latter animals would wade into the surf and spear the whales as they fed. It was a slaughter. That's why they're known as wrong whales.
Any paleontologist who's made their bones will tell you, "Find a mastodon, find a whale."