it's a random spawn chance, I believe it is possible by using spawn eggs which can be obtained through the creative inventory.
You cannot make a hang glider in Minecraft without mods.
There is no brass in MineCraft without mods.
Not in the current Vanilla (Minecraft without Mods) Minecraft, no. But their are a few Mods out there that will make that possible.
Guns can't be made in Minecraft without modding.
You must feed Pigs Carrots... (right clicking a pig with a carrot)... Feeding two pigs with carrots will make them BREED (and make a baby pig)!
There is no way to make zombies wear leather armor, but sometimes zombies can naturally spawn already wearing the armor.
When you throw it it will sometimes make a baby chicken.
Make The Girl Sleep in The Bed and Press Shift.
Without using mods, you can't.
You can't.
You cannot make planes in Minecraft 1.2.3 without mods.
They're mostly just trophies, to use as decoration, but can be incorporated into firework recipes to make an explosion in the shape of the monster's head.