A penguin. If all four walls face north the house must be at the southernmost point of the earth. Really, any native antarctic bird would work.
This brain teaser is quite similar to the guy whose house walls face south and sees a bear, then you’re asked the color of the bear. The bear would be white (a polar bear) as they’re the only bears indigenous to the north pole. A lawyer would claim it’s all circumstantial evidence and the bear could be an imported brown bear. The lawyer makes a valid point.
I am a five-letter word and am feared by most but experienced by all. If you remove my first and last letters I bring life. If you add an ‘r’ between the third and fourth letters I am almost nothing and if you remove the first letter from this new word, I am your home.
Death (eat, dearth, earth). No one can escape death, but many fear it. Removing the first and last letters leaves eat, and we must eat to stay alive. Adding the ‘r’ turns death into dearth, which is scarcity and removing the first letter of dearth leaves earth, where you live, assuming this riddle hasn’t reached extraterrestrials.