All 8 facts in this deck
Prefer to read them all at once? Here they are, each with its source.
Are bats blind?
Bats aren't blind, and many see well in near darkness. "Blind as a bat" gets it backwards. Bats have small eyes, but their vision is tuned for very low light, letting them see in conditions that look pitch black to us. What they lack is sharp, colorful daytime vision. Many species also use echolocation, so sight is just one of their tools.
Takeaway: Many bats see well in dim light, and some fruit bats see well in daylight too.
Source: Are bats blind? — U.S. Geological Survey, checked 2026-10-21.
Do ostriches bury their heads in the sand?
Ostriches don't bury their heads in the sand. Ostriches never hide their heads in sand. The myth probably comes from their nesting habits: they lay eggs in a shallow hole in the ground and regularly dip their heads down to check and turn them. When threatened, an ostrich may also press its head and neck flat to the ground to be less visible.
Takeaway: "Head in the sand" is a human habit, not an ostrich one.
Source: Ostriches and their heads in the sand — McGill University Office for Science and Society, checked 2026-10-21.
Are daddy longlegs the most venomous animals?
Harvestmen ('daddy longlegs' in the US) are not secretly deadly. A popular legend says these long-legged creatures carry deadly venom but can't bite us. Spider experts at the Burke Museum call it baseless. Harvestmen have no venom at all. In the US the nickname also covers cellar spiders, whose venom is harmless to people. In the UK, 'daddy longlegs' usually means the crane fly, a harmless insect.
Takeaway: Whatever your local 'daddy longlegs' is, it isn't dangerous to you.
Source: Myth: Daddy-longlegs would be deadly — Burke Museum, University of Washington, checked 2026-10-21.
Can porcupines shoot their quills?
Porcupines can't shoot their quills. No porcupine can fire quills like darts. The quills are hollow, modified hairs that are only loosely attached to the skin. When a predator bites or brushes against a porcupine, the quills pull free easily and stay lodged in the attacker, which makes it look as if they were launched.
Takeaway: Porcupines defend by contact, so keeping distance keeps you quill-free.
Source: North American porcupine — Smithsonian's National Zoo and Conservation Biology Institute, checked 2026-10-21.
How old can Greenland sharks get?
Greenland sharks can live for more than 250 years. Scientists aged Greenland sharks by carbon-dating proteins in their eye lenses that form before birth and never change. The largest shark studied was estimated at 272 to 512 years old. Even at the low end, that makes it the longest-lived animal with a backbone. They grow less than a centimeter per year.
Takeaway: Some sharks swimming today were likely born before the United States existed.
Source: How long do Greenland sharks live? — NOAA National Ocean Service, checked 2026-10-21.
Why do wombats poop cubes?
Wombats produce cube-shaped poop, shaped inside their intestines. Wombats are the only animals known to leave cube-shaped droppings. Researchers from Georgia Tech and the University of Tasmania found the shaping happens in the gut, not at the exit. Sections of the intestine wall are stiffer than others, and as the wall contracts, it presses the drying poop into flat sides and corners.
Takeaway: A soft, round tube can still make cubes if its walls stretch unevenly.
Source: Why wombats have cubed-shaped poop — Georgia Institute of Technology, checked 2026-10-21.
How many hearts does an octopus have?
An octopus has three hearts. Octopuses run on a split circulatory system. Two hearts are dedicated to the gills, pushing blood through them so it can pick up oxygen. A third heart then pumps that freshly oxygenated blood around the rest of the body. It is one of many ways their anatomy differs from ours.
Takeaway: Great trivia comeback: an octopus has two hearts just for breathing.
Source: Undersea creatures for Valentine's Day — NOAA National Ocean Service, checked 2026-10-21.
Which animal has the densest fur?
Sea otters have the densest fur of any mammal. Sea otter fur packs an estimated 850,000 to one million hairs into every square inch, more than any other mammal. A dense underfur sits beneath a layer of longer guard hairs. That thick coat is how a sea otter stays warm in cold Pacific water.
Takeaway: A patch of sea otter fur the size of a large postage stamp holds up to a million hairs.
Source: Sea Otter - Channel Islands National Park — U.S. National Park Service, checked 2026-10-21.