1 - In my language, the same animals are associated with the same adjectives.
2 - The moral of this folk storie can be: who is selfish and doesn't know to honor the benefits that already have, probably will lost everything that obtain.
3 - "One night, an owl was sitting in a tree when he saw a mouse walking along a path below him. So, the owl was be watching the mouse doing many things around here, like to dig a tunnel, to explore that new place where it find, to search and keep some food inside of its new tunnel, etc. Finally, when the mouse is very tired, the owl go down and catch him easily, because mouse didn't get to run. And eat him. After that, the tunnel with mouse's food becames a trap for another's mouse that came to these place. The lesson is: Who know to be waiting, always get what he want."