![sea otter, enhydra lutris, north america](https://www.rd.com/wp-content/uploads/2020/04/GettyImages-90068766-scaled.jpg?fit=700%2C480)
Fact: Sea otters hold hands when they sleep.
They do that because it keeps them from floating away from each other while they sleep. Here are some other fun facts about animals.
![Icelandic cow best friends kissing.](https://www.rd.com/wp-content/uploads/2020/04/GettyImages-1148323660-scaled.jpg?fit=700%2C468)
Fact: Cows have best friends.
And they tend to experience lower levels of stress when they’re hanging out with them! Sounds familiar.
![Young japanese macaque eating on a log](https://www.rd.com/wp-content/uploads/2020/05/GettyImages-164104755.jpg?fit=700%2C467)
Fact: Macaques in Japan know how to use vending machine snacks.
That’s not that impressive. We do that every day.
!['Nils Olav' the penguin receives his kni](https://www.rd.com/wp-content/uploads/2020/04/nils-olav-the-penguin-receives-his-kni.jpg?fit=700%2C466)
Fact: Norway knighted a penguin.
His name is Sir Nils Olav III, and he lives in Edinburgh Zoo. Three other members of his were family also made honorary members of the elite guard. Atten-shun!
![Premiere Of Disney's "Christopher Robin" - Stage Dedication To The Sherman Brothers](https://www.rd.com/wp-content/uploads/2020/04/premiere-of-disney-s-christopher-robin-stage-dedication-to-the-sherman-brothers.jpg)
Fact: The voices of Mickey Mouse and Minnie Mouse got married in real life.
Their names were Wayne Allwine and Russi Taylor. They tied the knot in 1991Â and remained together until Wayne passed away in 2009. Here are some other cool trivia facts.
![Male gentoo penguin offering stone to female, who is bowing while standing on rock, Mikkelsen Harbour on Trinity Island, Antarctica](https://www.rd.com/wp-content/uploads/2020/04/GettyImages-1069982520-scaled.jpg?fit=700%2C558)
Fact: Gentoo penguins propose to their mates with a pebble.
If the female penguin accepts the proposal, she uses the pebble as the basis for their nest. You might say it’s a good… foundation.
![Rubber ducks floating in lake](https://www.rd.com/wp-content/uploads/2020/04/GettyImages-80117345-scaled.jpg?fit=700%2C421)
Fact: Almost 30,000 rubber duckies were lost at sea in the ‘90s.
![Bottle nosed Dolphin (Tursiops truncatus) underwater, Honduras](https://www.rd.com/wp-content/uploads/2020/04/GettyImages-121783970-scaled.jpg?fit=700%2C465)
Fact: Dolphins give each other specific names.
![Couple Puffin on cliff in summer.](https://www.rd.com/wp-content/uploads/2020/04/GettyImages-555754554-scaled.jpg?fit=700%2C467)
Fact: Puffins mate for life.
They also make incredibly cozy homes for their babies. The parents also take turns taking care of their egg before it hatches. So sweet! These other animals also mate for life.
![Close-Up Of Bird Perching On Retaining Wall](https://www.rd.com/wp-content/uploads/2020/04/GettyImages-1083870746-scaled.jpg?fit=700%2C431)
Fact: Crows like to give presents.
![Bhutan: The Keepers Of The Secret To Eternal Happiness](https://www.rd.com/wp-content/uploads/2020/04/GettyImages-613715520-scaled.jpg?fit=700%2C467)
Fact: The concept of “Gross National Happiness” was coined by a king.
This measurement was first coined by the 4th King of Bhutan and measures thing like psychological wellbeing, health, and education.
![Young boy wearing a hearing aid.](https://www.rd.com/wp-content/uploads/2020/04/GettyImages-1203164816-scaled.jpg?fit=700%2C467)
Fact: A Marvel superhero has a hearing aid.
His name is “Blue Ear”, and he was created by Marvel Comics to encourage a little boy to wear his own hearing aids.
![Pod of sperm whale calves and juveniles in a social group, north western Mauritius, Indian Ocean.](https://www.rd.com/wp-content/uploads/2020/04/GettyImages-857317768-scaled.jpg?fit=700%2C467)
Fact: Sperm whales have BFFs.
![Eugene Cernan Driving LRV](https://www.rd.com/wp-content/uploads/2020/04/GettyImages-615298088-scaled.jpg?fit=700%2C589)
Fact: An astronaut wrote his daughter’s initials on the moon.
![KITTENS](https://www.rd.com/wp-content/uploads/2020/04/GettyImages-10100201-scaled.jpg?fit=700%2C499)
Fact: Vikings gave the cutest wedding presents.
![Baby Elephants Always Stick Out](https://www.rd.com/wp-content/uploads/2020/04/GettyImages-1129999377-scaled.jpg?fit=700%2C467)
Fact: Baby elephants suck on their trunks.
![93rd Annual Macy's Thanksgiving Day Parade](https://www.rd.com/wp-content/uploads/2020/04/93rd-annual-macy-s-thanksgiving-day-parade.jpg?fit=700%2C467)
Fact: The Pillsbury Doughboy has a name.
![Side View Of Hen With Eggs In Barn](https://www.rd.com/wp-content/uploads/2020/04/GettyImages-1159154349-scaled.jpg?fit=700%2C468)
Fact: Chicks start communicating with their mothers even before they even hatch.
![US-HEALTH-VIRUS](https://www.rd.com/wp-content/uploads/2020/04/GettyImages-1210072052-scaled.jpg?fit=700%2C525)
Fact: There’s a basketball court on top of the U.S. Supreme Court building.
![Omega European Masters - Day Two](https://www.rd.com/wp-content/uploads/2020/05/omega-european-masters-day-two.jpg)
Fact: Squirrels will adopt other squirrel babies.
![Close-Up Portrait Of Goats](https://www.rd.com/wp-content/uploads/2020/05/GettyImages-760232143-scaled.jpg?fit=700%2C467)
Fact: Goats have accents.
![Close-Up Portrait Of Quokka On Field](https://www.rd.com/wp-content/uploads/2020/05/GettyImages-1145794687-scaled.jpg?fit=700%2C467)
Fact: The quokka is the happiest animal ever.
![Kiss Moulding](https://www.rd.com/wp-content/uploads/2020/05/GettyImages-1203774016-scaled.jpg?fit=700%2C465)
Fact: Hershey Kisses are called “kisses” because of how it’s made.
![Seinfeld: The Apartment Fan Experience](https://www.rd.com/wp-content/uploads/2020/05/GettyImages-501444360-e1588705904143.jpg)
Fact: 46 episodes of “Seinfeld” feature a Superman reference.
![Apollo 11 Crew](https://www.rd.com/wp-content/uploads/2020/05/GettyImages-2635431-scaled.jpg?fit=700%2C533)
Fact: Neil Armstrong went through customs after returning from the moon.
![Young woman hugging dog on living room sofa](https://www.rd.com/wp-content/uploads/2020/05/GettyImages-1140004889-scaled.jpg?fit=700%2C467)
Fact: Dogs feel safe when they smell their humans.
![Fred Rogers on Mister Rogers' Neighborhood Set](https://www.rd.com/wp-content/uploads/2020/05/fred-rogers-on-mister-rogers-neighborhood-set.jpg)
Fact: Mr. Rogers was an ordained minister.
![Older man hugging grandchildren on sofa](https://www.rd.com/wp-content/uploads/2020/05/GettyImages-508486449-scaled.jpg?fit=700%2C467)
Fact: Cuddling is very good for you.
![Couple of cocker spaniel dogs playing outdoor](https://www.rd.com/wp-content/uploads/2020/05/GettyImages-656292722-scaled.jpg?fit=700%2C525)
Fact: Dogs sneeze to show they’re play-fighting.
![Trust in teamwork of bees bridging two bee swarm parts](https://www.rd.com/wp-content/uploads/2020/05/GettyImages-478066390-scaled.jpg?fit=700%2C467)
Fact: Honeybees can hold hands.
![Close-Up Of Guinea Pigs At Home](https://www.rd.com/wp-content/uploads/2020/05/GettyImages-753332477.jpg?fit=700%2C456)
Fact: In Switzerland, it’s illegal to only own one guinea pig.
![Canal with aquatic plants, brick houses and bridge in Weesp](https://www.rd.com/wp-content/uploads/2020/05/GettyImages-1150631968-scaled.jpg?fit=700%2C465)
Fact: There’s a village in the Netherlands made specifically to help people with dementia.
![Child lying on floor](https://www.rd.com/wp-content/uploads/2020/05/GettyImages-78160564.jpg?fit=700%2C468)
Fact: Humans learn to laugh and smile before they can speak.
![Common chimpanzee (Pan troglodytes) holding stick](https://www.rd.com/wp-content/uploads/2020/05/GettyImages-200325811-001.jpg?fit=700%2C459)
Fact: Baby chimps sometimes play with baby dolls.
![South African Monkey Gardeners](https://www.rd.com/wp-content/uploads/2020/05/GettyImages-111970499.jpg?fit=700%2C488)
Fact: Chimps will sometimes help humans.
![Woman walking on street](https://www.rd.com/wp-content/uploads/2020/05/GettyImages-1134003574.jpg?fit=700%2C465)
Fact: Smiling can lower stress.
![Cute little bunny outside](https://www.rd.com/wp-content/uploads/2020/05/GettyImages-1163679069.jpg?fit=700%2C467)
Fact: There’s an island in Japan filled with friendly rabbits.
![Ducks on grassy field](https://www.rd.com/wp-content/uploads/2020/05/GettyImages-965020714.jpg?fit=700%2C510)
Fact: Ducks shake their tails when they’re happy.
![USA](https://www.rd.com/wp-content/uploads/2020/05/GettyImages-566439177.jpg?fit=700%2C492)
Fact: A town in Alaska had a cat as mayor.
![One year old baby girl asleep in highchair at breakfast](https://www.rd.com/wp-content/uploads/2020/05/GettyImages-1134492526.jpg?fit=700%2C467)
Fact: Babies sleep 5,400 hours in the first year of their life.
Now that is a lot of sleep! We’re not jealous. Next, check out these 100 interesting and fun facts that will blow your mind.
Sources:
- Treehugger.com: “15 Fascinating Facts about Otters”
- BarnSanctuary.com: “The Science of Cow Friendship”
- BBC.com: “Dolphins ‘call each other by name'”
- Oceana.org: “Sea creatures ‘keep the love alive'”
- NBC: “King penguin receives Norwegian knighthood”
- Space.com: “Eugene Cernan”
- BBC.com: “Sperm whales can remember their friends”
- Cosmos Magazine: “Why are crows so smart?”
- National Geographic: “Quokka selfies”
- NPR: “Goats have accents”
- Science Daily: “Squirrels show softer side”
- Cosmos Magazine: “Unhatched chicks warn each other of danger”
- Norhalla.com: “Kittens for brides”
- HowStuffWorks: “Is Superman in every Seinfeld episode?”
- National Geographic: “Chimps play with dolls”
- MentalFloss.com: “It’s illegal to own only one guinea pig”
- Smithsonian Magazine: “Japan Rabbit Island”
- CBSnews.com: “Mr. Stubbs”