Answer:
Long slim and slender. Dark as homemade thunder. Keen eyes and peaked nose. Scares the Devil wherever it goes.
Oh how I love my dancing feet! They stay together - oh so neat. And when I want to walk a line, They all stay together and do double time. I count them up, ten times or more, And race on-off, across the floor.
It can be white or blue or black, Humped or have a horn. And when it talks it sings its menuets, as it's travelling the depths.
They swim around in schools or pods and they are related to whales
What jumps when it walks and sits when it stands?
The virgin gave birth to a child and threw away the blanket.