Keep clicking the mouse over the animals and they will eventually explode. Note: The explosion will not hurt anyone else.
Successfully complete the game on the hard difficulty setting to see a 20 second clip of StarCraft 2 running under the WarCraft 3 engine.
In Chapter 2 of the Undead campaign enable the "iseedeadpeople" code. Look at the left edge of the map until you find a waterfall. Have a unit go to the waterfall. You have to clear a path through the trees by attacking them. When you get to the waterfall, you will find the secret Pandaren relaxation area and see a photo of two panda bears.
Hydralisk Unit from StarCraft
When playing as Night Elves on the Daughters Of The Moon mission, just before the Undead base near the last door to the Night Elves base, you will get tree Ballista. Use the Ballista to hit the trees to the north and you will find a powerful Hydralisk (level 7) that will join you against the Undead base. If you cannot find it, enable the "iseedeadpeople" code to view the entire map.