Scientific name: Monodon monoceros
Pail is another word for a bucket, particularly an old-fashioned wooden bucket.
Scientific name: family: phasianidae
A rail is a long, thin piece of wood or metal that is fixed in place horizontally. Rails are often used like in the picture as a guard to stop people going past them. They can be fixed to a wall as a support somewhere people might need them, like in a shower cubicle.
A special type of rail is found on a railway track.
A scale is the singular of scales, or describes the amount smaller or larger something is from its real size.