Lepus cornutus and other paraleporids

In cryptozoology and folklore, there are a number of different paraleporids. That is, hares and rabbits that display unusual features like antlers and feathers. Hence the name lepus cornutus, Latin for "horned hare," for many varieties.

Ecology of blink beasts

Blink beasts are so named because they employ an unusual mode of travel, or “blinking.” The simplest application of blinking is short range teleportation, as in the MM entry. More advanced applications replicate the effects of conjuration and transmutation spells relating to planar travel like blink, dimension door, etherealness, plane shift, and teleport.

Famous examples of blink beasts include the blink bunny, blink dog, and blink mammoth.

the Duckbunny

While typically derided as the class experiment of apprentice wizards, I would posit that duckbunnies are in fact a naturally occurring animal related to the platypus.

• http://www.terminally-incoherent.com/blog/2008/07/30/stupid-monsters-of-dd/
• http://www.terminally-incoherent.com/blog/2014/03/31/bizarre-bestiary-the-dreaded-duckbunny/
• http://dungeonsandduckbunnies.blogspot.com/2015/03/duckbunny.html