The Kosher Guide to Imaginary Animals
If you thought that Rabbi Natan Slifkin was at the cutting edge of the intersection of Torah and the human and animal worlds, take a look at The Kosher Guide to Imaginary Animals: The Evil Monkey Dialogues
(hat tip) Below is one selection from here.
Mermaid
Long the bane of sailors, the mermaid is half-human, half-fish. Much like sirens but unlike their distant cousins the banshees, they often have the thankless job of singing to sailors to enchant them or lure them to their deaths.
Kosher? If the mermaid is Jewish, the rabbi will probably marry you.