Frequency signatures: Electric Eel to Eurasian Bullfinch
Each card gives a species’ behavioural archetype, its frequency — how often it commits effort and how long each commitment lasts — and a waveform tracing that rhythm.
Frequency signatures
Each waveform traces one species’ working rhythm — where it spends effort, and where it waits. 2,327 species, A–Z; showing 721–744.
Electric Eel
Making Hidden Prey Twitch Itself
Low pulses running continuously • Reading the field • Breathing air
That is a bimodal system: constant quiet sensing, and very brief enormous output.
Elephant Beetle
Horn Paid for at Pupation
Levering • Contesting • Unrepairable
A fixed body, a short season and contests decided by pushing make this a single high-frequency system.
Elephantnose Fish
Reading Distortions in a Self-Made Field
Electrolocating • Probing • Nocturnal
That makes it a bimodal system: active nocturnal electrolocation and a quieter daytime rest in which the field is never switched off.
Elf Owl
Miniature Cavity Specialist
Sheltered • Hidden • Anchored
This makes the Elf Owl a bimodal system with a low-frequency shelter mode and a mid-frequency nocturnal hunting mode built around precise use of tiny refuges.
Elk
A Whistle From a Body That Size
Herded • Grazing • Migratory
That makes it a bimodal system: steady herd life and a short exhausting vocal contest.
Elongated Tortoise
Narrow-Shell Undergrowth Passage
Low • Narrow • Monsoon-paced
Because the animal moves slowly and is active for only part of the year, it is a low-frequency system.
Emerald Cockroach Wasp
Two Stings, the Second Into the Brain
Searching • Small • Unarmoured
That makes it a bimodal system: unremarkable searching and two surgically exact interventions.
Emerald Toucanet
A Bill That Works as a Radiator
Working canopy fruit • Reaching from a perch • Dumping heat through the bill
This is a mid-frequency system.
Emerald Tree Boa
Pit-Guided Drop Strike
Coiled • Cooled • Weeks-long
Because near-zero maintenance alternates with brief total commitment, this is a bimodal system.
Emerald Tree Skink
Green Held Against Green
Vertical • Exposed • Tolerated
That makes it a mid-frequency system: active, exposed and sociable within a vertical space.
Emperor Goose
A Pair Working the Bering Tideline
Tide-feeding • Coastal • Family-grouped
That makes it a bimodal system: a tide-timed coastal feeding routine and a still, concealed breeding phase.
Emperor Newt
Rib-Backed Gland Row Warning
Marked • Glandular • Slow
Because everything runs at a very low rate, it is a low-frequency system.
Emperor Penguin
The Rotating Shield
Collective • Rhythmic • Risk-sharing
That makes the emperor penguin a mid-frequency system: rhythmic, collective and organized around rotating risk.
Emperor Scorpion
Big Claws Mean Mild Venom
Waiting in a burrow • Grasping • Rarely stinging
This is a low-frequency system.
Emperor Tamarin
Shared Carrying, Two-Species Watch
Troop-paced • Vocal • Handing-over
Continuous coordinated group operation makes this a mid-frequency system.
Emu
Walking After the Rain
Walking • Nomadic • Following
That makes it a bimodal system: continuous travelling and a long stationary fast.
Epaulette Shark
Walking Across the Dry Bit
Walking • Tolerant • Shutting down
That makes it a low-frequency system: slow, tolerant and built to persist through what cannot be escaped.
Española Lava Lizard
Island-Specific Push-Up Signal
Displaying • Territorial • Island-specific
Holding ground depends on repeating the same cheap signal through the warm hours rather than on rare fights, and that recurring display is why the lizard runs as a mid-frequency system.
Ethiopian Wolf
Hunting Alone, Defending Together
Stalking • Seizing • Patrolling
That makes it a mid-frequency system: steady daily solitary foraging inside a collectively defended patch of one very particular habitat.
Eupterote Fabia Moth
Larval-to-Adult Body Rebuild
Growing • Accumulating • Sheltered
Because the organism uses one long, low-intensity growth-and-build phase and one short, high-intensity dispersal-and-reproduce phase, its life history forms a bimodal system built around a decisive stage change.
Eupterote Moth
A Coat That Detaches
Larvae covered in dense fine hairs that are brittle and detach at the slightest contact • Those hairs barbed and hollow, carrying irritant compounds, and small enough to be carried on air • Contact producing intense itching and dermatitis in people and predators alike, hours after the encounter
Because outbreaks run seasonally, it operates as a low-frequency system.
Eurasian Bittern
Bill-Up Reed Stance
Vertical • Swaying • Waiting
Because the system runs on stillness and short close-range commitments, it is a low-frequency system.
Eurasian Blackcap
A Direction That Changed Fast
Inheriting a compass bearing rather than a route • Departing on that bearing at a genetically set time • Producing offspring that take the parents' direction
Since departures and song bouts recur seasonally within a steady life, it operates as a mid-frequency system.
Eurasian Bullfinch
Eating Next Spring in Winter
Working along a branch stripping dormant buds • Taking hundreds a day through late winter • Switching to ash keys and seeds when those are available
Since bud-taking recurs constantly, it operates as a mid-frequency system.