The Deep Sea's Cutest Survivor
Like Duolingo, but for The Deep Sea's Cutest Survivor. Tomo turns the whole topic into a game you play five minutes a day, until it actually sticks.
For the part of you with thirty open tabs that never became anything.
A short one: 26 levels across 3 sections, about 52 minutes end to end, roughly 10 days at five minutes a day. It moves through Spotting a Dumbo in the Wild, Life in the Midnight Zone, and The Science of the Abyss. It starts from scratch.
Free forever · No credit card · iPhone & Android

Key ideas in The Deep Sea's Cutest Survivor
- The flaps are fins used for locomotion
- Dumbo octopuses use neutral buoyancy and fins to stay off the bottom
- These fins allow the octopus to hover and steer in the water column
- The functional purpose of the Dumbo octopus's ear-like flaps
- Typical octopuses rely more on jet propulsion or crawling
- Distinguishing Dumbo octopus movement from typical octopus behavior
- The Dumbo octopus has a unique 'bird-like' swimming profile
- The fins provide a distinct visual silhouette compared to other cephalopods
- Visual identification based on movement style
- Jet propulsion is energy-intensive and unsustainable in the food-scarce deep ocean
- Flapping fins allows for low-energy, efficient travel
- Fins provide the main movement through the water column
- Webbing between arms creates a 'bell' shape for pulsing forward
- Why the Dumbo octopus uses fins instead of jet propulsion
- The specific roles of body parts in Dumbo octopus locomotion
- Deep-sea environments have limited food resources
You've tried the other tabs
Thirty open tabs. Four facts you actually kept.
You watched. You nodded. By Sunday it was gone.
One answer, then back to scrolling.
Eight weeks. You meant to finish. You didn't.
Tomo gives The Deep Sea's Cutest Survivor the Duolingo treatment: levels, streaks, and quick quizzes that test what you just learned. That game loop is what the tabs above never had, so it's the one you actually finish.
Here's what playing it feels like
A real question from this course. Take your best guess.
How does the Dumbo octopus typically spend its time compared to its shallow-water cousins?
Get it right to open this lesson and 25 more in the app.
Where The Deep Sea's Cutest Survivor takes you
Meet the world's deepest-living octopus and discover how it survives in the dark. Learn how its 'ears' and gentle nature make it a master of the ocean floor.
- 1
Spotting a Dumbo in the Wild
- How to recognize those 'ears'
- The way they dance through water
- Why they look like floating bells
- The many colors of the deep
- 2
Life in the Midnight Zone
- Finding a snack in total darkness
- Living without an ink sac
- How to survive the heavy pressure
- Meeting a mate on the sea floor
- The mystery of the translucent skin
- Why they never touch the sand
- 3
The Science of the Abyss
- How we find them with robots
- The family tree of umbrella octopuses
- Why they grow so slowly
3 sections · 13 units · 26 levels. Built to play, not to enroll.
You pick the voice
The Deep Sea's Cutest Survivor is taught in the The Bestie style: your friend who just gets it. Want a different feel? In the app you can spin up the same topic in any of Tomo's teaching styles. Same facts, totally different vibe.
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Start The Deep Sea's Cutest Survivor today.
Download Tomo, search The Deep Sea's Cutest Survivor, and play your first lesson in under a minute.