Mammals
Axolotl: The One in the Lab Is Part Tiger Salamander
The axolotl is critically endangered in Xochimilco and abundant in laboratories, where pedigree analysis says it carries 5.8 per cent tiger salamander DNA.
Fennec Fox: The Kidneys Are Doing More Work Than the Ears
A 1982 study found the fennec fox's basal metabolic rate runs 39 per cent below prediction, and a 2023 genome study identified candidate genes associated with kidney adaptation.
African Wild Dog: GPS Data Found a 15.5% Kill Rate, Not 80%
A 2016 GPS and accelerometer study found individual African wild dogs catch prey on just 15.5% of attempts, undercutting the 80% figure conservation groups still repeat.
Fishing Cat: Males Range Up to 10 Times Farther, GPS Data Show
GPS collars on fishing cats in Colombo and in Nepal both found males ranging far wider than females, by a factor of three in one study, ten in the other.
Pallas's Cat: One Drug Cut Kitten Deaths From 100% to 5.88%
Two zoo collections had lost every kitten to toxoplasmosis until a 2014 antibiotic protocol cut first-year mortality to 5.88 percent, a published trial found.
Basilisk Lizard: Why It Can Run on Water and You Never Could
A Harvard force-plate study explains the slap-and-stroke mechanics behind the 'Jesus Christ lizard,' and the physics shows exactly why no human could copy it at Earth gravity.
Margay: A Wild Cat Recorded Faking a Baby Monkey's Cry
In 2005, researchers in Brazil watched a margay mimic a baby tamarin's cry to lure a sentinel monkey close. It's the first such case recorded in a wild cat of the Americas.
Wild Cat Species: The Official Count Is Already Out of Date
The IUCN's official species page still says 40 wild cats. Two peer-reviewed revisions since 2021 have already split that number past it, and the two counts have never been reconciled.
Why Do Cats Hate Water? Vets Explain the Real Causes
Penn Vet and Joybound behaviorists explain why cats hate water: fur that stops insulating once soaked, lost control, and an ancestor built for dry land.
How High Can Cats Jump? The Real Numbers
A housecat's standing jump runs roughly five to six times its own body length, and a 2002 hind-limb study explains why. A 2025 Guinness record adds the extreme case.
Only 4 of the 5 Big Cat Species Can Roar
Genus Panthera has five species, four of which produce the typical roar. A 1989 dissection study found one of them is missing the specific tissue that makes the roar happen.
Clouded Leopard: One Name, Two Separate Species
A 2006 genetic study and a matching morphological study split one species into two. A separate study found its skull mirrors extinct sabertooth cats.
Why Do Cats Purr? What Actually Causes It
Cats purr through vocal-fold vibration at 25 to 150 Hz, and a 2023 experiment produced purr-range oscillation in excised larynges without neural input, challenging decades of assumed neural control.
Maned Wolf: Germination Jumps From 1% to 62%
The maned wolf isn't a wolf, fox, or dog. Its droppings raise its favorite fruit's seed germination from under 1% to over 60%, a real study found.
Dhole: A Wild Dog That Calls in Two Pitches
The dhole belongs to its own genus rather than being a wolf species, and its whistle-like call often carries two independent pitches at once, a real bioacoustics finding, not a description.
Why Do Dogs Howl? It Depends on the Breed
Wolves and dogs share the same 150-to-780 Hz howl, but a 2023 study found only some breeds still answer it, tied to how genetically close they are to wolves.
Horse Gait: 1878 Photos Proved Painters Wrong
The real beat counts and speeds behind each horse gait, the 1878 trip-wire photos that proved centuries of paintings wrong, and why horses switch gaits exactly when they do.
Are Dogs Smarter Than Pigs?
A 2019 study raised pigs and dogs under identical conditions, then tested both. Dogs read a pointing gesture on the first try; every pig missed it and did something else instead.
Why Do Cats Make Biscuits on Me? The Evidence
Kneading is a familiar cat habit and a thinly studied one. Experts say much of the explanation is still theory. Here is what each source supports.
Why Do Dogs Dig the Bed? What the Evidence Says
Dogs paw at their beds before lying down. Vets point to dens, stress, pain, and hormones, but no study has tested bed digging itself. Here is what each source supports.
Humpback Whale vs Blue Whale: The Differences
The blue whale is far bigger: up to 110 ft and 330,000 lb against about 60 ft and 40 tons. NOAA figures on size, feeding, sound, and how to tell them apart.
Red Wolf vs Coyote: The Differences
Red wolf vs coyote: FWS puts red wolves at 45-80 lb and 26 inches at the shoulder against a coyote's 20-50 lb, plus why the two species keep interbreeding.
Why Do Cats Sleep at Your Feet? The Evidence
Older guidance cites 30 to 38°C, but EFSA questions that adult-cat range. About two in three cats bonded securely in a lab test. No study reviewed here tested the foot of the bed.
Are Sand Cats Dangerous? Only If You're Prey
Sand cats weigh 1.5 to 3.4 kg and avoid people, but they kill venomous vipers. No study backs the venom-immunity claim, and the real danger is the pet trade.
Cats Recognize Themselves in Mirrors? Untested
Every pet blog says cats fail the mirror test. A 2025 review found almost no cat research behind that claim, and cats tell each other apart by scent.
Raccoon Dog vs Raccoon: Not Even the Same Family
A raccoon dog is a fox-like canid from East Asia and a raccoon is a North American procyonid. A three-way table covers size, tail, winter habits and EU status.
Difference Between Wolves and Dogs: Species, Behavior, Body
Gray wolves and domestic dogs share ancestry but not the same lived niche. A side-by-side table covers taxonomy, domestication, social reading of humans, and body clues.
How Smart Is a Dog Compared to a Human?
The popular "dogs equal a 2-year-old" line comes mainly from Stanley Coren's language-cue estimates. What that comparison includes, what it leaves out, and how to read it.