Loonycorn

Loonycorns are a strange species of "horse" as Explorer calls it. They arrived on April Fools Day out of a portal box. Loonycorns were declared criminally insane by Mayor McFlapp within three minutes of them arriving.

Background
If you ask any Loonycorn about their homelands or their past, they always say this:

"I went to Candy Mountain, saw the Banana King and made a snowman!"

They will then blow raspberries at you.

Nevertheless, it is sure they came from another dimension. Loonycorns first appeared on April Fool's Day, when they jumped out of a portal box. More and more came. Billybob greeted them, and they called him Charlie. This made Director Benny very angry and he did not approve. Mayor McFlapp considered Loonycorns criminally insane, like Mwa Mwa Penguins.Loonycorns are now widespread across Antarctica, but none live on the islands. They continuously reference "Fugoo Fish", "Leopluradons" and "Charlie". It can only be assumed that these are creatures from their universe.