Dolphin



The Dolphin is the mount of the Dolphin Rider Zombie. According to the Suburban Almanac and the Plants vs. Zombies game trailer, the dolphin is a zombie too, but it does not gets its own entry in said almanac. Only appearing in the Pool, the Dolphin will jump over the first plant it encounters (besides Tangle Kelp) and will then disappear, leaving its rider to continue on.

Strategy
The best ways to counter dolphins (or actually, Dolphin Rider Zombies) is to either plant a Tall-nut in front, which the Dolphin cannot jump over, or plant a Lily Pad in the second column from the right to make the Dolphin Rider Zombie lose its dolphin, after which the zombie can be killed normally.

Another way is to plants a Tangle Kelp in the Dolphin Rider Zombie's path, dragging both to their watery deaths.


 * Note: If a Lily Pad or other Aquatic Plant is planted in the first column of the pool, the dolphin will not jump, as it enters the water partway into the second column.

Trivia

 * In the music video Zombies on Your Lawn, the Dolphin says "I'm gonna eat your brains!" even though it would usually be its rider which would actually eat your brains if it reaches your house.
 * Also, in Zombies on Your Lawn, when the other zombies say "We are the undead!" the Dolphin says "We are SO the undead!".
 * This is the only non-humanoid zombie so far (excluding the zombie worm, which is not encountered in Adventure Mode).
 * The dolphin, for some reason, cannot be killed by a Squash.
 * When the Dolphin Rider Zombie dies without jumping, the Dolphin somehow disappears with it.
 * When jumping, the dolphin will make a noise.
 * The Dolphin also makes a distinct noise when it and the rider are about to enter the pool to alert the player.
 * Because of the dolphin's swimming powers, the Dolphin Rider Zombie is faster than the average zombie before it jumps.
 * On the Plants VS Zombies trailer for PC, at the end, the dolphin says, "I'm a zombie too".
 * It and Stinky are the only animals in the game.