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 From the Heart of the World: The Elder Brothers' Warning S10E1 9.4
#5 The Urban Elephant S19E4 9.4
#6 Leopard: A Darkness in the Grass S5E8 9.3
#7 The Nature of Sex: The Sex Contract S12E6 9.2
#8 Crater Lions S15E2 9.2
#9 Extraordinary Cats S17E14 9.2
#10 Triumph of Life: The Four Billion Year War S19E7 9.2

Lowlights

#363 S31E10 The Mystery of Eels 6.5

Eels can be found all over the globe, in fresh and salt water ecosystems alike. But today, risk of over-fishing and the presence of dams and other obstacles that prevent eels from reaching their oceanic spawning grounds pose new threats to an animal that once roamed the planet alongside the dinosaurs. Artist, writer, and naturalist James Prosek explores the mysterious world of the eel.

#362 Cracking the Koala Code S30E13 6.5
#361 Deep Jungle: Monsters of the Forest S23E11 6.6
#360 The Reptiles: Lizards S21E11 6.7
#359 Amate: The Great Fig Tree S1E4 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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