Frequency signatures: Eurasian Collared Dove to European Hornet
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 745–768.
Eurasian Collared Dove
Spilled-Grain Breeding Engine
Settled • Prolific • Grain-fed
That makes it a mid-frequency system: rhythmic, unspectacular and built on continuous reliable intake rather than on any decisive capability.
Eurasian Eagle-Owl
Oversized Talon Reach
Cliff-perched • Watching • Resident
That makes it a bimodal system: a long cheap resident watch and a brief, unusually powerful strike.
Eurasian Harvest Mouse
A Fifth Grip in the Stalk Zone
Climbing • Weaving • Stalk-bound
That makes it a phase-change system: a climbing season above ground and a sheltered winter beneath the stalks.
Eurasian Jay
Thousands of Acorns, Each Remembered
Caching • Carrying • Scattered
That makes it a bimodal system: a short intense storing phase and a long patient retrieval one.
Eurasian Lynx
Guarding a Kill That Lasts Days
Stalking • One large kill • Several days at the carcass
This is a low-frequency system.
Eurasian Magpie
Recognising Itself in a Mirror
Investigating a reflection as though it were another bird • Noticing a mark on its own throat in the mirror • Scratching at the mark on its body rather than at the glass
Since investigative bouts recur through the day, it operates as a mid-frequency system.
Eurasian Oystercatcher
Tide-Timed Chisel Bill
Rhythmic • Skilled • Tool-like
That tide-linked, tool-using routine makes them a mid-frequency system: steady, rhythmic, and built around repeated skilled actions instead of extremes of conservation or explosive bursts.
Eurasian Reed Warbler
Rejecting a Stranger's Egg
Weaving a deep cup slung between standing reed stems • Inspecting the clutch and comparing eggs against each other • Ejecting an egg that does not match, and reacting to a cuckoo at the nest by mobbing
Since nest inspections recur constantly, it operates as a mid-frequency system.
Eurasian Sparrowhawk
Two Sizes Hunting Different Prey
Females up to twice the mass of males • The male taking tits and finches, the female taking thrushes and pigeons • A pair working prey ranges that barely overlap
Since strikes recur through the day, it operates as a high-frequency system.
Eurasian Spoonbill
A Paddle That Moves Water, Not Mud
Sweeping • Flattened • Snapping
That makes it a mid-frequency system: a steady sweep sampling water rather than searching it.
Eurasian Tree Sparrow
A Colony in Other People's Holes
Colonial • Cavity-bound • Flocked
That makes it a mid-frequency system: steady, social and entirely dependent on structure it did not build.
Eurasian Wolf
Holding Territory by Sound
Howling as a chorus at territorial boundaries • Being answered or not from kilometres away • Adjusting movement to avoid the neighbours that answered
Since chorus events recur across weeks, it operates as a low-frequency system.
Eurasian Woodcock
Cryptic Forest Floor Sensor
Hidden • Patient • Probing
This combination of cryptic stillness and fine-grained sensing makes the woodcock a low-frequency system: slow, patient, and built around repeated, subtle probing from a hidden position.
European Badger
A Sett Dug by Generations
Inherited • Extended • Shared
That makes it a low-frequency system: slow, cumulative and structural.
European Bee-eater
Perch-to-Strike Flight Circuit
Perched • Watchful • Sheltered
This makes their system a bimodal pattern: a low-frequency, perch-and-burrow anchored waiting mode, and a high-frequency, short-burst aerial snatch mode that only activates when food and safety briefly overlap.
European Chub
A Throat Mill, No Teeth
Taking anything from insects to fruit to small fish at the surface or the bed • Crushing it with paired pharyngeal teeth in the throat • Holding station in current behind cover
Since feeding events recur through the day, it operates as a mid-frequency system.
European Crane Fly
Leatherjacket-Funded Breeding Burst
Underground • Feeding • Accumulating
With almost a year of slow saving underground and only days of spending above it, the two stages never overlap, and the crane fly is bimodal: low-frequency accumulation as a larva, high-frequency breeding as an adult.
European Eel
Decades Inland, One Unseen Ocean Crossing
Nocturnal • Sedentary • Growing
Because the system is a long, patient growth phase ended by a single oceanic migration, it is a phase-change system.
European Field Cricket
Singing From a Horn
A burrow dug into short turf with a widened flared entrance and a cleared platform in front of it • The male singing from that platform rather than from open ground • The flared opening coupling the sound to the air far more efficiently, so the same wing movement carries considerably further
Because the song cycles many times a second, it operates as a mid-frequency system.
European Flounder
A Flatfish That Goes Upriver
Lying on soft bottom in estuaries and coastal shallows • Regulating internal salt concentration actively as the water changes • Moving far upriver into fresh water and back to the sea to spawn
Since movements follow the tide, it operates as a mid-frequency system.
European Goldfinch
Tweezer Bill in a Thistle Head
Probing • Fine • Reserved
That makes it a mid-frequency system: steady, precise and repeated many times over for small returns.
European Greenfinch
A Bill That Cracks Hard Seed
Holding a hard seed in a groove in the palate • Applying jaw force from unusually large adductor muscles • Splitting the husk and extracting the kernel
Since seeds are handled continuously, it operates as a mid-frequency system.
European Hedgehog
A Drawstring Muscle Round the Whole Body
Snuffling • Noisy • Unbothered
That makes it a bimodal system: unbothered noisy foraging and a complete mechanical closure.
European Hornet
After-Dark Foraging Shift
One mated queen • Overwintering in a crevice • Starting the comb alone
Because a solitary founding state and a large hunting colony are both indispensable and neither reduces to the other, this is a bimodal system.