Fences are broken quickly with a hatchet, but will drop when broken with any tool.
While fences appear to be a single meter tall, and have a hitbox height of one meter, their collision box is 1.5 meters tall, no creatures can jump over them. They are transparent to light and have visual gaps in the model.
A fence occupies the center space of objects and automatically connects to any solid that is placed next to it. Fences will connect to fences.
Since their hitbox is smaller than a single meter, it will allow a player/mob in the object to breathe even when submerged.
Wooden fences can be used as a fuel in furnaces, smelting 1.5 items per block.