Episode Ratings Grid

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Episode Power Rankings

The peaks and the valleys. Find the essential episodes — and the ones to skip.

#1
S19E16 9.5
Australia's Little Assassins

When animals are the subject, most people associate Australia with lovable koalas and leaping kangaroos. But an even more distinctive aspect of Australian wildlife is its abundance of animals -- from snakes and spiders to a host of marine life forms and at least one mammal -- that use venom to defend themselves, attack prey, and in some cases help digest food.

#2
S24E13 9.5
Crime Scene Creatures

They are among the most reliable witnesses to a crime — expert in their testimony and bulletproof in their account. Yet they never utter a single word. They are the animals, plants, and insects that are being recruited by a special breed of forensic scientists to solve the most seemingly impenetrable of crimes.

#3
S3E5 9.4
The Face of the Deep

Examines the variety of plants and animals living in the Sargasso Sea, a gigantic floating bed of seaweed near Bermuda.

#4 The Urban Elephant S19E4 9.4
#5 Leopard: A Darkness in the Grass S5E8 9.3
#6 From the Heart of the World: The Elder Brothers' Warning S10E1 9.3
#7 The Nature of Sex: The Sex Contract S12E6 9.2
#8 Extraordinary Cats S17E14 9.2
#9 Triumph of Life: The Four Billion Year War S19E7 9.2
#10 Hippo Beach S22E1 9.2

Lowlights

#361 S30E13 Cracking the Koala Code 6.4

Follow individual koalas from a small social group on an Australian island to learn just how a koala manages to survive and thrive on a diet poisonous to almost all other herbivorous mammals. From the miracle of marsupial birth to tender moments of discovery between mother and newborn joey, encounters with threatening forest creatures, battles between rival males and the complex chorus of bellows and grunts that have become so important to science -- join leading scientists as they unravel just what a forest needs to support a healthy population of koalas by listening to these marsupials themselves and cracking the koala code.

#360 The Mystery of Eels S31E10 6.5
#359 Deep Jungle: Monsters of the Forest S23E11 6.6
#358 The Reptiles: Lizards S21E11 6.7
#357 Big Red Roos S20E8 6.7

The Quality Arc

Each point is an episode, plotted in order. Colored bands mark season boundaries. Look for the rise, the plateau, or the decline.

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Episode Engagement

High votes + high rating = beloved classic. High votes + low rating = notorious stinker. Low votes + high rating = hidden gem.

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Series Trajectory

One point per season. Smooths out the episode-to-episode noise to reveal the bigger arc.

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Season Momentum

Did each season build or fizzle? Green means the finale outscored the premiere. Red means the opposite. Longer arrows, bigger swings.

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Season Consistency

How steady is each season? Tightly clustered dots mean reliable quality. Scattered dots mean a wild ride.

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