🐀 WHAT SURVIVED THE ASTEROID?
PAGE 1 OF 5 — EARTH'S WORST DAY
66 MA
WHO MADE IT THROUGH?
Some creatures made it through Earth's worst day, but most giants did not. When the asteroid darkened the sky, size became a liability. A multi-tonne sauropod needed tonnes of plants every week; when forests died, it starved within weeks. A Tyrannosaurus needed vast territories of prey; when food chains collapsed, it had nowhere to go. Small, flexible animals with varied diets, shelter, and fast breeding had a far better chance.
📏 THE SIZE RULE
📏 Under ~25 kg body mass = better survival odds
🦕 Giants needed constant food supply
🌑 Impact winter lasted months to years
🦕 Giants needed constant food supply
🌑 Impact winter lasted months to years
"Small, tough, and flexible beat huge."
LIVE!
GONE
🦖 Tyrannosaurs and sauropods gone
🦈 Marine reptiles mostly lost
🌋 Ash buried entire ecosystems
🦈 Marine reptiles mostly lost
🌋 Ash buried entire ecosystems
HERE
🐦 Birds = feathered dinosaurs
🐊 Crocodilians in rivers
🐢 Turtles and lizards endured
🐊 Crocodilians in rivers
🐢 Turtles and lizards endured
PAGE 2 OF 5 — RULES OF SURVIVAL
SURVIVAL
WHAT HELPED WINNERS WIN
Winners often shared four traits: small bodies, general diets, shelter (burrows, rivers, deep forests), and fast reproduction. A mouse-sized mammal could hide underground and live on seeds, roots, and insects. A specialised giant had no backup plan when its one food source vanished. Evolution after the K-Pg rewarded versatility, not sheer size.
🏆 FOUR SURVIVAL TRAITS
🕳️ Burrows shielded from heat and cold
🌰 Seeds outlast dying forests
🐊 Rivers stayed warmer than open land
🌰 Seeds outlast dying forests
🐊 Rivers stayed warmer than open land
RULES!
FOOD
🌰 Seeds and roots still edible
🪲 Insects survived in soil
🍄 Fungi on rotting wood
🪲 Insects survived in soil
🍄 Fungi on rotting wood
SHELTER
🕳️ Burrows blocked deadly heat
💧 Rivers and lakes as refuges
🐟 Some marine fish pulled through
💧 Rivers and lakes as refuges
🐟 Some marine fish pulled through
EGGS
🥚 Smaller clutches, faster growth
🐣 Young mature in one season
🔄 Populations recover quicker
🐣 Young mature in one season
🔄 Populations recover quicker
PAGE 3 OF 5 — MAMMALS IN THE SHADOWS
NIGHT
👃 Keen smell for food at night
🦷 Different teeth = varied diet
🏃 Quick, nervous movement
🦷 Different teeth = varied diet
🏃 Quick, nervous movement
GAP
📉 Dinosaur niches suddenly empty
🌱 Flowering plants spread later
🐋 Whales return to the sea
🌱 Flowering plants spread later
🐋 Whales return to the sea
MAMMALS
TINY UNDERDOGS, BIG FUTURE
Before the impact, mammals were mostly small, nocturnal, and living in the shadow of dinosaurs. They scurried at night while giants ruled the day. When dinosaurs fell, empty niches opened, in trees, on the ground, and in the water. Over millions of years mammals diversified into bats, whales, elephants, and eventually us. The asteroid was catastrophic, but it rewrote the cast of life's story.
🐀 MAMMAL RISE
🐀 Largest pre-K-Pg mammals ≈ badger size
🌙 Night life avoided dinosaur competition
📈 Mammal explosion took millions of years
🌙 Night life avoided dinosaur competition
📈 Mammal explosion took millions of years
RISE!
PAGE 4 OF 5 — BIRDS: DINOSAURS THAT MADE IT
BIRDS
FEATHERS = SURVIVAL GEAR
Birds are living dinosaurs, the feathered branch that sailed through the extinction. Feathers insulated against cold snaps after the impact winter. Flight let some populations escape local fires and floods. Beaks cracked hardy seeds when soft fruit disappeared for years. Every sparrow on a fence carries 150 million years of dinosaur DNA.
🐦 LIVING DINOSAURS
🪶 Feathers evolved before flight
🌰 Seed-eating birds had a food edge
🦖 Birds are theropod dinosaurs officially
🌰 Seed-eating birds had a food edge
🦖 Birds are theropod dinosaurs officially
FLY!
SEEDS
🌰 Beaks open tough seeds
🌿 Ground-cover plants recover
🪺 Nests hidden in thickets
🌿 Ground-cover plants recover
🪺 Nests hidden in thickets
SIZE
🐦 Most survivors stayed small
🥚 Eggs in protected nests
⚡ Fast generations rebuild numbers
🥚 Eggs in protected nests
⚡ Fast generations rebuild numbers
WATER
🦆 Waterbirds near fish and plants
🏝️ Islands as survival pockets
🌊 Coasts milder than inland
🏝️ Islands as survival pockets
🌊 Coasts milder than inland
PAGE 5 OF 5 — LESSONS FOR TODAY
LESSON
RESILIENCE MATTERS
K-Pg survivors teach ecology 101: flexibility beats specialization in a crisis. Specialists dominate when the world is stable; generalists endure when everything breaks. Understanding who survived helps scientists ask which animals are most at risk from climate change, habitat loss, and ocean acidification today.
📚 LESSON FOR TODAY
🌍 Today's sixth extinction debate
🦕 Past shocks took millions of years to heal
🐦 Birds prove dinosaurs never fully died
🦕 Past shocks took millions of years to heal
🐦 Birds prove dinosaurs never fully died
THINK!
RECAP
☄️ Asteroid 66 million years ago
🐀 Small generalists won
🐦 Birds carry dino DNA
🐀 Small generalists won
🐦 Birds carry dino DNA
REMEMBER
🦕 KEY FACTS
💀 Five mass extinctions next
🌍 Earth's biggest die-offs
🌍 Earth's biggest die-offs
🧠 QUIZ TIME!
WHAT SURVIVED THE ASTEROID? · 5 QUESTIONS
QUESTION 01
Which body size tended to survive the K-Pg better?
QUESTION 02
Why did general diets help survival?
QUESTION 03
Birds survived because they are…
QUESTION 04
Mammals before the impact were mostly…
QUESTION 05
The asteroid struck about how long ago?
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