Original subtitles

♪♪

Narrator: ANIMALS...

DO THE MOST INCREDIBLE THINGS.

[ GOAT BLEATS ]

LIKE THIS...

AND THIS.

I BET YOU'RE WONDERING, "HOW DO THEY DO THAT?"

WE'RE REVEALING ANIMALS' BIGGEST SECRETS, LIKE...

HOW CAN FOUR DOGS WRANGLE 500 SHEEP?

WHY DO MOTHS FLY INTO FLAMES?

AND WHY DO ROOSTERS ALWAYS CROW JUST BEFORE DAWN?

THESE WONDERS AND MORE ON...

--Captions by VITAC-- www.vitac.com

CAPTIONS PAID FOR BY DISCOVERY COMMUNICATIONS

AUSTRALIA IS HOME TO JUST ABOUT

EVERY DEADLY CREATURE YOU CAN THINK OF...

♪♪

...AND SOME NOT SO DEADLY, LIKE SHEEP --

OVER 72 MILLION AT LAST COUNT.

THAT'S THREE SHEEP TO EVERY HUMAN LIVING DOWN UNDER.

HEY!

Narrator: JUST OUTSIDE MELBOURNE,

FARMER DAVID HAS 500 SHEEP.

THEY'VE BEEN OUT IN THE FIELDS,

AND NOW IT'S TIME FOR EVERY LAST ONE TO RETURN TO THE PEN.

IT'S AN IMPOSSIBLE JOB FOR DAVID,

BUT NOT FOR HIS INCREDIBLE SHEEP DOGS.

THIS IS THE SHEEP-HERDING DREAM TEAM.

LEADER OF THE PACK IS CHECKERS,

A 13-YEAR-OLD BORDER COLLIE CROSS,

FOLLOWED BY 4-YEAR-OLD KELPIES SISCO, PILLAR, AND BLUE TACK...

HOP UP. [ WHISTLES ]

Narrator: ...AND OF COURSE, FARMER DAVID.

HOP UP, PILL. GOOD JOB.

THEY'RE PRETTY KEEN TO SEE SOME SHEEP NOW, I RECKON.

AREN'T YA?

♪♪

Narrator: THERE ARE 344 OFFICIAL BREEDS OF DOG,

BUT ONLY ABOUT 40 CAN DO WHAT THESE GUYS DO.

THAT'S BECAUSE THEY SHARE AN INSTINCT FOR PACK HUNTING,

TO HERD PREY BEFORE A KILL.

BUT SHEPHERDS LIKE DAVID HAVE FIGURED OUT

HOW TO TAP THE DOG'S INSTINCT AND HIGH ENERGY.

Sleigh: THE DOGS ARE NATURAL HUNTERS.

IT'S A MATTER OF CURBING THEIR HUNTING INSTINCT.

YOU TRY AND REDUCE THE KILLER IN THEM

AND JUST HARNESS THE HERDING INSTINCT

THAT GOES WITH PACK BEHAVIOR.

[ WHISTLES ] YEAH.

Narrator: DOGS OF THIS BREED ARE NATURALLY OBEDIENT,

AND FARMER DAVID USES THIS TO TEMPER THEIR INSTINCT TO KILL.

FROM ONE YEAR OLD, ONCE PAST THOSE PLAYFUL PUPPY DAYS,

SHEEP DOGS ARE TRAINED TO OBEY THE LEADER OF THE PACK --

ALWAYS REWARDED FOR OBEYING THE TOP DOG'S DEMANDS.

THE TOP DOG HERE IS FARMER DAVID,

AND FARMER DAVID SAYS SHEEP ARE STRICTLY OFF THE MENU.

[ WHISTLING ]

THE DOGS APPROACH THE 500 SHEEP.

AS THEY DO, THE SHEEP HUDDLE TOGETHER FOR SAFETY.

IF THE DOGS GET TOO CLOSE, THE SHEEP WILL SCATTER,

BUT IF THEY HANG BACK TOO FAR,

THE FLOCK CAN SPLIT INTO SMALLER GROUPS.

♪♪

NEW RESEARCH HAS SHOWN THAT THE SHEEP DOGS

CONSTANTLY SCOUR THE FLOCK

FOR GAPS OPENING BETWEEN THE SHEEP.

IF THEY SEE ONE, THEY POSITION THEMSELVES TO DISCOURAGE

ANY MOVEMENT OF SHEEP AWAY FROM THE MAIN HERD.

NO DRAMAS.

Narrator: BUT THE DOGS AREN'T ON AUTOPILOT,

AND FROM THEY STAND, THEY CAN'T SEE THE WHOLE FLOCK.

[ WHISTLES ]

Narrator: FARMER DAVID CAN SEE EVERYTHING

AND KNOWS WHERE HE WANTS HIS SHEEP TO GO.

HE WHISTLES INSTRUCTIONS TO DIFFERENT DOGS.

TO THE UNTRAINED EAR,

ONE WHISTLE SOUNDS JUST LIKE THE NEXT...

[ WHISTLING ]

...BUT TO THE SUPER FINE HEARING OF A DOG,

THE FARMER'S VARIOUS WHISTLES MEAN DIFFERENT THINGS.

♪♪

WITH A SUBTLE CHANGE TO THE NUMBER OF WHISTLES,

THE FARMER CAN MAKE THE DOGS MOVE TO THE RIGHT...

[ WHISTLES ]...AND MOVE TO THE LEFT.

CHANGING THE LENGTH OF HIS WHISTLE

TELLS THE DOGS TO STOP...

[ WHISTLE ]...OR MOVE FORWARD.

[ WHISTLING ]

Narrator: THE DOGS AREN'T JUST OBEDIENT.

THEY'RE ALSO GOOD AT MATH -- THE MATH OF SHEEP BEHAVIOR.

TO SHOW WHAT THESE ARE,

FARMER DAVID IS GOING TO WALK INTO A FLOCK.

IT'S LIKE THERE'S A FORCE FIELD SURROUNDING HIM,

PUSHING THE SHEEP AWAY.

Sleigh: IF I GET ANY CLOSER --

SEE HOW THEY'VE KEPT THAT RING AROUND ME?

Narrator: ACTUALLY, THIS IS A MENTAL FORCE FIELD

AROUND THE SHEEP.

IT'S CALLED A FLIGHT ZONE.

Sleigh: THE FLIGHT ZONE IS THE DISTANCE THE SHEEP

WOULD LIKE TO KEEP BETWEEN YOU AND THEM.

Narrator: GET CLOSER THAN ABOUT 10 FEET TO A SHEEP,

AND IT WILL MOVE AWAY TO KEEP THAT SAFE DISTANCE.

AND THOSE CLEVER DOGS HAVE LEARNED TO THINK LIKE A SHEEP

AND USE IT TO NAVIGATE THE FLOCK.

THE DOGS USE THE 10-FEET FLIGHT ZONE

TO CONTROL THE DIRECTION AND MOVEMENT OF THE FLOCK.

AS THEY SPRINT UP AND DOWN THE REAR OF THE FLOCK,

THEY EDGE INTO THE FLIGHT ZONE TO FORCE THE SHEEP LEFT,

RIGHT, OR FORWARDS.

Sleigh: YOU'VE GOT TO MASSAGE THAT FLIGHT ZONE

TO WITHIN A FOOT OR TWO

SO THAT YOU GET THEM WALKING FORWARD.

♪♪

[ WHISTLING ]

THAT'S GOT THEM MOVING A BIT QUICKER NOW.

Narrator: NOW FARMER DAVID NEEDS TO GET THE SHEEP

THROUGH A SINGLE GATE.

Sleigh: [ WHISTLES ] HERE, HERE.

SO WE'RE CALLING THEM OVER NOW

BECAUSE THE SHEEP ARE GOING PAST THE GATE,

SO WE'RE CALLING THEM OVER TO THE RUN-IN SIDE.

[ WHISTLING ] STEADY.

Narrator: MOVING AROUND THE EDGE OF A FLOCK,

THE DOGS STEER THE SHEEP TOWARD THE FENCE...

UNTIL ONE FINDS THE GAP IN IT.

THEN, BECAUSE THEY'RE SHEEP, WHERE ONE GOES, THE REST FOLLOW.

Sleigh: THAT'S IT.

JOB DONE.

Narrator: AN HOUR AND A HALF LATER,

AND FOUR DOGS AND ONE HUMAN

HAVE COUNTED 500 SHEEP BACK INTO THE PEN.

♪♪

WE ALL KNOW DIAMONDS ARE A GIRL'S BEST FRIEND,

BUT OTTERS HAVE A PASSION FOR PEBBLES.

AND IT'S A LOVE THAT CAN LAST FOR MONTHS, SOME THINK YEARS.

A CLUE IS IN THEIR DIET.

A SEA OTTER'S LUNCH COMES TO THE TABLE READY FOR A FIGHT.

♪♪

CLAMS, ABALONE, SNAILS --

ALL HEAVILY ARMORED WITH THICK, TOUGH SHELLS.

AND SEA OTTERS NEED TO EAT

A QUARTER OF THEIR BODY WEIGHT OF THEM EVERY DAY.

THAT'S THE EQUIVALENT OF A MAN DINING ON OVER 30 T-BONE STEAKS.

♪♪

TO CRACK SO MANY HARD SHELLS,

SEA OTTERS HAVE EVOLVED TO HAVE SUPER TOUGH TEETH.

IN FACT, THE ENAMEL IN THEIR TEETH

IS OVER 2 1/2 TIMES TOUGHER THAN OURS.

EXTRA LAYERS OF A SPECIAL PROTEIN-RICH GEL

PREVENTS OTTER TEETH FROM CRACKING

AS THEY BITE DOWN ON THEIR PREY.

BUT FOR SOME MEALS,

EVEN REINFORCED TEETH ARE NOT STRONG ENOUGH.

♪♪

FOR THOSE REALLY TOUGH SHELLS, THE SEA OTTER USES A TOOL,

AND THE TOOL OF THEIR CHOICE IS A PEBBLE.

OTHER THAN DOLPHINS,

SEA OTTERS ARE THE ONLY MARINE MAMMAL THAT USE TOOLS.

BUT THIS TOOL IS NOT JUST ANY PEBBLE.

IT HAS TO BE HEAVY AND HARD ENOUGH

TO USE AS A HAMMER OR AN ANVIL WITHOUT SHATTERING.

IT MUST BE SMOOTH ENOUGH

SO THE SEA OTTER CAN HOLD IT IN THEIR PAWS

AND SMALL ENOUGH TO KEEP IN A UNIQUE PEBBLE POCKET

SEA OTTERS HAVE UNDER ONE OF THEIR LIMBS.

♪♪

IN FACT, WHEN THEY FIND THE PERFECT PEBBLE,

IT IS SO PRECIOUS

THAT THEY MAY KEEP IT FOR UP TO A YEAR OR MORE.

♪♪

AND TO IMPROVE THEIR AGILITY AND DEXTERITY

WITH THEIR FAVORITE TOOL,

SEA OTTERS PRACTICE BY JUGGLING WITH THEIR PEBBLES.

AND ALTHOUGH NO ONE REALLY KNOWS WHY, SO DO RIVER OTTERS,

EVEN THOUGH THEY DON'T USE A PEBBLE

AS A TOOL FOR GETTING TO FOOD OR HAVE A PEBBLE POCKET.

♪♪

MAYBE OTTERS JUST LIKE JUGGLING.

♪♪

COMING UP...

NIGHT FLYERS WITH A FATAL ATTRACTION...

THE SECRET BEHIND THE ROOSTER'S CROW...

AND WHY IS THIS SEA TURTLE CRYING?

♪♪

♪♪

Narrator: AS NIGHT FALLS ON A BALMY SUMMER'S EVENING,

MILLIONS OF MOTHS ARE TAKING TO THE SKY.

AND THEN...

THAT'S GOT TO HURT.

WHY DO THESE NOCTURNAL NAVIGATORS

ALWAYS MAKE A BEELINE FOR A BULB?

THEY SEEM TO BE DRAWN TO LIGHT LIKE MOTHS TO A...

WELL, YOU KNOW.

TO FIND OUT WHY MOTHS HAVE SUCH A FASCINATION WITH LIGHTS,

WE'VE COME TO A FLORIDA FOREST IN THE DEAD OF NIGHT,

WHERE MOTH EXPERT ERIC ANDERSON IS PERFORMING A TEST.

Anderson: IT'S VERY HUMID OUT.

PERFECT CONDITIONS. NEW MOON.

AND MAYBE WE'LL GET SOME COOPERATION FROM THE INSECTS.

Narrator: ERIC'S BRIGHT IDEA IS TO SEE HOW MOTHS REACT

TO THREE DIFFERENT KINDS OF LIGHT.

FIRST UP, A TYPICAL WHITE PORCH LIGHT.

ALL RIGHT.

THERE'S ALREADY A FEW THINGS COMING IN.

MOTHS FLY JUST STRAIGHT TO IT.

Narrator: MOTHS ARE DRAWN TO THE WHITE LIGHT

BECAUSE OF HOW THEY'VE EVOLVED TO NAVIGATE

USING THE BRIGHT LIGHT OF THE MOON.

♪♪

WHEN LUNAR LIGHT

HITS ULTRA-SENSITIVE RECEPTORS IN MOTHS' EYES,

IT TELLS THEM WHAT'S UP AND WHAT'S DOWN.

THE SKY IS BRIGHT, THE GROUND DARK,

BUT MOONLIGHT ALSO TELLS A MOTH DIRECTION.

BY KEEPING A FIXED ANGLE ON THE DISTANT SOURCE OF MOONLIGHT,

THE GLOW HELPS THEM FLY IN A STRAIGHT LINE.

BUT TO A MOTH, THE ARTIFICIAL WHITE LIGHT ON OUR FRONT PORCHES

APPEARS TO BE THE MOON, AND THE BUG BECOMES CONFUSED.

SINCE HOUSE LIGHTS ARE MUCH CLOSER THAN THE MOON,

THE RELATIVE ANGLE CHANGES...

AND BAM, RIGHT INTO THE LIGHT.

THEY BECOME DISORIENTED

AND FLY RIGHT TOWARDS IT UNCONTROLLABLY.

Narrator: NEXT, ERIC WANTS TO SEE IF MOTHS ARE CAPTIVATED

BY THIS COOL BLUE FLUORESCENT LIGHT.

Anderson: HERE WE HAVE A LOT OF GUYS COMIN' IN.

THIS IS GOOD.

THEY'RE JUST REALLY ATTRACTED TO THEM.

THEY CAN'T FIGHT IT.

Narrator: THE FLUORESCENT BLUE LIGHT IS A MOTH MAGNET.

MOTHS AND BUTTERFLIES ARE ATTRACTED TO BLUE LIGHT

BECAUSE THEIR EYES CAN DETECT

PARTS OF THE LIGHT SPECTRUM WE CAN'T -- ULTRAVIOLET.

THEY USE THIS SPECIAL ABILITY TO IDENTIFY MARKINGS ON FLOWERS

THAT CAN ONLY BE SEEN IN U.V.

U.V. MARKINGS ON A FLOWER IS A SIGN THAT IT CONTAINS NECTAR,

WHICH MOTHS EAT.

Anderson: WHEN FLYING AROUND IN PITCH DARKNESS

AND THERE'S A LIGHT IN THE BLUE SPECTRUM,

OR VIOLET SPECTRUM, THEY JUST COME RIGHT TO THE LIGHT.

Narrator: SO THE BUGS THINK THE BLUE LIGHT

IS GUIDING THEM TOWARDS DINNER.

THAT'S WHY THE FLUORESCENT BLUE LIGHT OF A BUG ZAPPER

IS SO EFFECTIVE.

BUT IT'S A FATAL ATTRACTION.

[ ELECTRICITY CRACKLING ]

SO IS THERE A LIGHT THAT MOTHS ARE NOTATTRACTED TO?

WE'RE ABOUT TO APPROACH A LIGHT

THAT IS ON THE OPPOSITE END OF THE SPECTRUM,

MORE OF AN ORANGEY YELLOW.

Narrator: WITH THE WARM L.E.D. BULB,

THERE DOESN'T SEEM TO BE MUCH BUG ACTIVITY

ON THE BED SHEETS.

SO HERE'S TWO HOUSE FLIES.

Narrator: AND ANY MOTHS?

Anderson: NO MOTHS.

Narrator: IN A RECENT TEST,

9,000 INSECTS WERE EXPOSED TO DIFFERENT LIGHTS,

AND IT TURNED OUT THE BUGS WERE LEAST ATTRACTED

TO THE WARM L.E.D.

[ DING! ]

AND THAT'S BECAUSE MOTHS ARE UNABLE TO DETECT LIGHT WAVES

IN THE ORANGE AND YELLOW PART OF THE VISIBLE SPECTRUM.

AND YOU KNOW WHAT THAT MEANS.

IF YOU DON'T WANT INSECTS ON YOUR PORCH,

GET A BULB THAT'S ORANGEY YELLOW, AND IT'LL WORK.

♪♪

ALL RIGHT.

♪♪

Narrator: COMING UP, WHY DO TURTLES CRY?

AND THE SECRET TO CLOCKWORK CROWS.

[ ROOSTER CROWS ]

♪♪

♪♪

Narrator: SEA TURTLES HAVE BEEN GLIDING

THROUGH OUR WORLD'S OCEANS FOR 200 MILLION YEARS,

ONLY EVER COMING ON LAND TO LAY THEIR EGGS...

♪♪

...WHERE, TO BE HONEST, THEY'RE SLIGHTLY LESS ELEGANT.

IN FACT, SEA TURTLES STRUGGLE SO MUCH OUT OF THE WATER,

IT SEEMS TO BRING THEM TO TEARS.

♪♪

LEGEND HAS IT THAT MOTHER TURTLES CRY

BECAUSE THEY CAN'T STAND

LEAVING THEIR BABIES BEHIND ON THE BEACH.

BUT THEY DON'T JUST CRY WHEN THEY SAY GOODBYE --

THEY CRY ALL THE TIME, IN THE WATER AND OUT.

SO...

WE'VE COME TO THE LOGGERHEAD MARINELIFE CENTER IN FLORIDA,

WHERE DR. JUSTIN PERRAULT CARES FOR INJURED TURTLES.

♪♪

CURRENTLY, WE HAVE ABOUT 10 SEA-TURTLE PATIENTS HERE

THAT ARE REHABILITATING.

Narrator: THIS SAD-LOOKING GUY IS GAVIN, A TEENAGE LOGGERHEAD

WHO WAS FOUND WITH A FISHING HOOK IN HIS FLIPPER.

AND THAT ISSOMETHING TO CRY ABOUT.

HE IS A SUB-ADULT MALE THAT IS RIGHT ON THE CUSP OF MATURITY.

HE'S NOT COMPLETELY FULLY MATURE YET.

Narrator: BUT AFTER SOME TURTLE TLC,

GAVIN IS STILL SUPER WEEPY.

AND A CLUE TO WHY CAN BE FOUND IN THE TEARS THEMSELVES.

Perrault: THE SECRETION THAT YOU'RE SEEING

IS THREE TIMES THE CONCENTRATION

OF THE SALT THAT WE SEE IN THE BLOOD,

AND IT CAN ACTUALLY BE TWICE THAT OF SEAWATER.

Narrator: THESE THICK, BRINY TEARS

ARE NEARLY 10 TIMES AS SALTY AS HUMAN TEARS.

Perrault: WHAT YOU'RE SEEING WITH THESE TEARS

IS HOW THIS ANIMAL RIDS ITS BODY OF ITS EXCESS SALT.

♪♪

Narrator: MARINE TURTLES CONSTANTLY DRINK SALTY SEAWATER.

AND THEIR DIET OF JELLYFISH, SEA GRASS,

AND ALGAE IS FULL OF SALT, TOO.

WHAT SALT CAN DO IN THE BODY, IF YOU HAVE TOO MUCH OF IT

AND YOU'RE NOT GETTING RID OF ENOUGH OF IT,

WHAT WILL HAPPEN IS IT WILL CAUSE YOUR INTERNAL CELLS

TO SHRIVEL AND POTENTIALLY DIE.

Narrator: MOST ANIMALS GET RID OF EXCESS SALT

THROUGH THEIR KIDNEYS,

BUT TURTLES TAKE IN MORE THAN THEIR KIDNEYS CAN COPE WITH.

SO THEY EVOLVED SPECIAL ORGANS IN THEIR HEAD

TO ELIMINATE THE EXCESS.

Perrault: SO WHAT WE'VE GOT HERE IS A REPLICA

OF A LOGGERHEAD SEA-TURTLE SKULL.

YOU'VE GOT YOUR HOLE FOR THE BRAIN, WHICH IS VERY SMALL,

AND THEN YOU'VE GOT YOUR TWO ADDITIONAL HOLES.

Narrator: THESE TWO CAVITIES HOUSE ORGANS CALLED SALT GLANDS.

INCREDIBLY, IN SOME TURTLES,

THEY CAN BE UP TO 20 TIMES LARGER THAN THE TURTLE'S BRAIN.

BUT THESE REPTILES DON'T NEED TO THINK --

THEY NEED TO DRINK.

WHEN SEA TURTLES TAKE IN SEAWATER,

SALT QUICKLY ENTERS THE BLOODSTREAM.

THIS BRINY BLOOD IS SENT STRAIGHT TO THE TWO GLANDS.

HERE, EXCESS SALT IS FILTERED OUT

AND EXCRETED AS THICK, GLOOPY TEARS.

♪♪

SO THAT MEANS TURTLES ARE BASICALLY CRYING

EVERY MINUTE OF EVERY DAY FOR THEIR ENTIRE LIVES.

♪♪

BUT THEY'RE NOT TEARS OF SADNESS --

THEY'RE TEARS OF SURVIVAL.

♪♪

[ TIGER GROWLS ]

NEXT...

WHY DO ROOSTERS ALWAYS CROW JUST BEFORE THE CRACK OF DAWN?

[ ROOSTER CROWS ]

♪♪

♪♪

Narrator: 5:00 A.M...

[ ROOSTER CROWS ]

...AND ONE EARLY RISER IS ALREADY UP AND AT 'EM.

[ ROOSTER CROWS ]

ROOSTERS ARE NATURE'S ALARM CLOCK,

WHETHER NATURE WANTS TO WAKE UP OR NOT.

[ ROOSTER CROWS ]

[ ROOSTER CROWS ]

♪♪

THIS HANDSOME GUY IS RORY.

[ RORY CROWS ]

WHEN HE GETS GOING, HE CROWS AT AN EAR-SPLITTING 100 DECIBELS.

THAT'S AS LOUD AS A JACKHAMMER.

[ JACKHAMMER WHIRRING, RORY CROWS ]

YOU'D THINK WITH ALL THIS RACKET, RORY WOULD GO DEAF,

BUT EVERY TIME HE OPENS HIS BEAK...

[ RORY CROWS ]

...MUSCLES IN HIS EAR CANALS PARTIALLY CLOSE,

BLOCKING THE SOUND.

THAT'S RIGHT, RORY'S GOT BUILT-IN EAR PLUGS.

[ RORY CROWS ]

♪♪

ON THIS FARM...

[ ROOSTER CROWS ]

...RORY RULES THE ROOST.

THE REASON HE CROWS SO EARLY IS SO HE CAN CROW FIRST

TO SHOW THE OTHERS WHO'S BOSS.

[ ROOSTER CROWS ]

ONCE RORY'S FANFARE HAS BROKEN THE SILENCE,

A COUPLE OF HOURS BEFORE DAWN,

ONLY THEN CAN THE OTHERS JOIN IN.

[ ROOSTERS CROWING ]

ITS BARNYARD CODE FOR PECKING ORDER.

SO KING ROOSTERS LIKE RORY GET UP EARLY

TO BE THE FIRST TO CROW...

[ ROOSTER CROWS ]

...BUT HOW DO THEY KNOW WHEN IT'S TWO HOURS BEFORE DAWN?

ARE THEY REACTING TO THE FIRST RAYS OF MORNING SUN?

TO FIND OUT, RESEARCHERS IN JAPAN KEPT SOME RAUCOUS ROOSTERS

IN A ROOM FOR TWO WEEKS AND TURNED THE LIGHTS OFF.

♪♪

DESPITE HAVING NO STIMULUS

TO REVEAL WHETHER IT WAS NIGHT OR DAY,

THEY ALWAYS CROWED WITHOUT FAIL...

[ ROOSTERS CROWING ]

...TWO HOURS BEFORE DAWN BROKE OUTSIDE.

THIS TEST PROVED ROOSTERS HAVE A BUILT-IN BIOLOGICAL CLOCK

SET TO A SPECIFIC TIME.

FROM FUNGI TO BUTTERFLIES,

ALL LIVING THINGS HAVE GENES IN THEIR CELLS

THAT DICTATE THE RHYTHMS OF THEIR DAY,

LIKE WHEN TO WAKE...

AND WHEN TO CATCH 40 WINKS.

WHAT THE JAPANESE EXPERIMENT REVEALED, HOWEVER,

WAS THE ROOSTER'S BODY CLOCK IS SET TO A 24-HOUR CLOCK.

WELL, 23.8 TO BE EXACT.

AND IT'S SO HARD-WIRED

THAT TAKING AWAY A SUNRISE CAN'T DISRUPT IT.

SO IT'S RORY'S BIOLOGY

THAT KEEPS HIM TOP OF THE PECKING ORDER.

[ RORY CROWS ]

IF HE STARTS RUNNING LATE WITH HIS MORNING CROWS...

[ RORY CROWS ]

...IT TELLS HIS RIVALS THAT HE'S PAST HIS PRIME,

AND THEY'LL CHALLENGE HIM TO BE TOP COCK ON THE BLOCK.

♪♪

[ ROOSTER CROWS ]

AND FOR ANYONE WHO THINKS A HEN MIGHT BE A QUIETER OPTION...

[ HEN CROWS ]

...HENS CROW, TOO.

[ HEN CROWS ]