The elephant has one of the largest bladders among land mammals, capable of holding around 160 liters (42 gallons) of urine, but interestingly, marine animals like whales, specifically the fin whale, produce massive amounts daily (around 260 gallons), making them champions of urine output, though not necessarily just a single bladder capacity comparison. For land mammals, elephants have huge bladders that empty at similar speeds to smaller animals due to longer urethras.
An elephant's bladder is about 1 1/2 feet tall. But its urethra is three feet long. If you could fit inside the end of the elephant's urethra, you'd feel the pressure of 4 1/2 feet of urine above you: the three-foot urethra plus the 1 1/2-foot bladder.
Platypus, without a doubt is the best designed bladder. Fill one and fill a camelbak and decide for yourself.
"Blue whales have the largest penises on Earth. An erect blue whale penis is 12 inches (30 cm) in diameter and ten feet in length.
You might think that elephants take longer to empty their bladders than humans do, because pachyderms are so much larger. But you'd be wrong. Recent research shows that most animals, including humans, take the same amount of time to pee.
In general, it should take about 20 seconds to pee. You can set a timer, or simply by counting “one-Mississippi, two-Mississippi,” Dr. Miller says. If you're significantly over or under 20 seconds, you're likely holding your pee too long or going too often.
Right whales have the largest testicles in the animal kingdom, reaching a combined mass of 1,000 kg, which corresponds to 2% of their total weight.
Drosophila bifurca is a species of fruit fly. Males of this species are known to have the longest sperm cells of any organism on Earth—5.8 cm long when uncoiled, over twenty times the entire body length of the male.
The study found that chaps in the South American nation of Ecuador were the most well-endowed, with an average length of 17.61cm. Cameroon, Bolivia, Sudan and Haiti rounded out the top five, all averaging over 16cm.
Blue Whale is the animal with the largest mammary gland in the world. Note: Female whales have offspring every 1 to 5 years, though this varies greatly depending on the species. The whales do not reproduce more frequently, giving the calves plenty of time to mature and increase their chances of survival.
🌍 Top 5 Dirtiest Animals in the World 🦠 1️⃣ 🐀 Rats – Spread deadly diseases like plague & leptospirosis. 2️⃣ 🪳 Cockroaches – Carry bacteria & love dirty places. 3️⃣ 🐖 Pigs – Often linked with mud & parasites (though farmed pigs can be clean). 4️⃣ 🦝 Raccoons – Cute but carry rabies & roundworms.
In terms of size alone, this accolade of the animal with the biggest testicles goes to the right whale, whose testes weigh a massive 1,000kg. Proportionately, however, it's the tuberous bush cricket, whose testes amount to an impressive 14 per cent of its body mass.
Female kangaroos have one tail, two feet and three vaginas when they're giving birth. Kangaroos are pretty peculiar on the outside: They're the world's largest marsupials, they hop to get around, and they use their tails as a fifth limb.
When Alanis achieved the record for the first time in 2019, 11 of his sittings were disqualified due to the bathroom breaks he took. The determined Florida man had to endure 720 hours (30 days) watching “No Way Home” between December 16, 2021 and March 15, 2022 to secure the crown.
And, despite being much smaller, so could an adult cat. And a goat. Also a cow. Because researchers find that all mammals that weigh more than six-and-a-half pounds or so take about the same time to pee: 21 seconds, plus or minus 13 seconds.
It takes 3.6 inches from the root of the penis to the tip of the glans to hit the 50th percentile for flaccid length. That means 68 percent of men measure between 3 and 4.2 inches, and 95 percent are in the 2.4- to 4.8-inch range.
What is the average penis size? According to research, the average penis size is around 5 inches. But let's dig a little deeper into these findings. In 2025, researchers looked through 33 studies on penis size, with data on over 36,000 men from around the world.
In general, smaller flaccid penises lengthen at erection by a greater percentage than larger flaccid penises, with most men reaching an average size of 5 to 7 inches when erect.
Milt (sometimes spelled melt) or soft roe also refers to the male genitalia of fish when they contain sperm, used as food. Many cultures eat milt, often fried, though not usually as a dish by itself. As a food item, milt is farmed year-round in nitrogen tanks, through hormone induction or photoperiod control.
Human semen is composed of fluids from the seminal vesicles, prostate, and bulbourethral glands which mix during ejaculation. The seminal vesicles contribute 70% of semen volume, which contains fructose as the main energy source for sperm.
The coquí, native to Puerto Rico, is famous for its loud, two-note mating call, which reaches sound levels of up to 95 decibels. Males produce this call, which sounds like "co-kee," to attract females and establish territory.
Whales do not menstruate, nor do most mammals. Only primates and, oddly, elephant shrews menstruate. (Dogs may seem to menstruate, but it is actually a different process.)
Several conditions can cause swollen testicles, including trauma, cysts and testicular cancer. Healthcare providers can diagnose and treat the cause.
Compensating: Loudest howler monkeys have the tiniest balls.