From tiny T. rexes to a car-sized sea monster, we revisit some of our favourite stories about predators in their prime, like:Smaller tyrannosaur solves decades-long debate about the T. rexAmong Yellowstone’s top predators, wolves beat out cougars as the top dogBears with us. Tracking grizzlies in B.C.Cleveland’s ancient car-sized sea monster had bony fangs made out of its skullWild wolves run for their lives when they hear Big Bad Humans nearbyWhy penguin-eating pumas live closer together in Patagonia

From camping out on 'bird poop island,' chasing down wild dogs in Madagascar, or even looking for bombs in a bog in Ottawa –– no one quite does summer like scientists. This week, we revisit some of the hijinks that Canadian researchers got up to last year as they left their labs to get their hands dirty in the field.FEATURING:Camping out on a remote island with thousands of screaming, pooping, barfing birdsDodging lions and mongooses to monitor what wild dogs are eating in MozambiqueSaving ancient silk road graffiti from dam-inundationProspecting for Second World War bombs in an Ottawa bogTechnology allows examination of Inca mummies without disturbing themEavesdropping on chatty snapping turtles in Algonquin Park

Quirks & Quarks has been taking your burning science questions for half a century. And while we thought we might have answered every question there is to answer over the years, our listeners proved there are always more fascinating head-scratchers for us to tackle.Like:Are comets eternal?In a sauna, what am I sweating out?Did dinosaurs produce milk?If heat rises, why is there snow on the top of mountains?What does a black hole orbit?What if we had no moon?Why are cat and dog tongues so different?Why are robin eggs so blue?Why do some animals become mega sized?How do animals deal with strong bright UV light?

Some of the oceans biggest, most powerful predators, like certain sharks and tuna, are “mesothermic” or warm-bodied. Running hot allows them to rapidly convert their food to energy and heat, helping them swim faster and hunt in cold waters. But that advantage may become a disadvantage in a warming climate, meaning these fish need to find new ways of cooling off, or face a new threat to their survival.PLUS:Ancient Peruvians traded parrots across deserts and mountainsFrom the archive: David, Jay and Bob, and Quirks & Quarks' origin storySea cucumber 'zombie tissue' straddles the line between life and deathDream engineering may help you solve problems in your sleep

Gold miners working in the Yukon regularly find ancient ground squirrel burrows throughout the permafrost, many containing fossilized feces. Researchers analyzing these well-preserved poop piles found they contain some of the oldest DNA ever recovered, dating from 30,000 to 700,000 years ago. Tucked inside were traces of a wide range of ancient animals, including woolly mammoths, grasshoppers, steppe bison, ancient horses, American cheetahs, as well as hundreds of plant species.PLUS:‘Super-good, ice-making microbes’ may trigger snow and rain, or help freeze foodWe’re a hotbed of mutations, and scientists are leveraging that for our healthGoing out on a limb. Animals regrow body parts, maybe we can tooFrom the archives: Isaac Asimov on human creativity and robots

150 years ago, Charles Darwin noticed that birds and humans were both drawn to bright plumage and elaborate display. He called this interspecies esthetic appreciation a “shared taste for the beautiful.” Now, in a recent study, an interdisciplinary team of scientists built an online game exploring the mating calls of 16 different species and discovered, to their surprise, that humans and animals agree on which sounds are more attractive.PLUS:How the brain can learn to truly multitaskFrom the archives: The Russian space mirror that flashed across Canadian skiesThe Matrix is real: birds, dragonflies and dogs see the world in slow motionCould the next giant particle collider unlock the mysteries of the universe?

The newly described Tylosaurus rex was a violent bus-sized Komodo dragon-like creature with serrated teeth. Dubbed the ‘T. rex of the sea,’ it would have occupied the top of the food chain in the marine ecosystem over 80 million years ago.PLUS:Pigeons use their livers to find their way homeFrom the archives: How Jocelyn Bell Burnell discovered pulsars Scientists discover an underground network of lakes hidden under Arctic ice New book explores the million year history of how we sleep — and why we’re doing it wrong today

Scientists recorded audio and video of 8 different kinds of rockfish living in the wild near British Columbia, and were surprised they could tell the species apart through their various grunts, pops and knocks, even though the fish are closely related.PLUS:DNA identifies four Franklin Expedition sailors — and solves a 160-year-old mysteryImmune cells that fight infection get a boost from food Radio waves let us see the unseeable: black holes, pulsars and volcanoes on VenusFrom the archives: What will the Earth look like in 2050?Quirks Question: If chicken and fish blood is red, why are they white meats? 

In a study inspired by a field of dandelions, researchers wanted to know why, when you blow on a dandelion seed head, only the seeds closest to you take flight. They found that a dimple in the seed heads where the seed attaches is larger on one side than the other, and that the seeds consistently broke off from the smaller side of that dimple. Once they take flight, each dandelion seed uses its unique shape to catch a ride on the wind.PLUS: Infrasound, not ghosts, may be why old buildings give us the heebie-jeebiesThese arms are made for lovin'. How male octopuses find their matesFrom the archives: Donald Johanson on the discovery of 'Lucy,' our missing linkVirtual hearts help doctors fix patients’ life-threatening irregular heart beatsQuirks Question: What’s the benefit for trees being evergreen?

On the morning of August 10, 2025, a landslide in a fjord along the southern Alaskan coast triggered a mega tsunami. It generated the second highest wave ever recorded that reached up to 481 metres above sea level. A new study suggests that catastrophic events like this are more likely to occur as our climate warms and glaciers melt.PLUS:The hantavirus at the centre of the outbreak struck Argentina in 2018. What did we learn?Raccoons enjoy solving puzzles, just for the fun of itWhat animal parents and distant humans can teach us about caregivingFrom the archives: face to face with the man who killed PlutoQuirks Question: why do my car windows make a ‘wha wha wha’ sound?