Frequency signatures: Harlequin Duck to Hieroglyphic Cicada
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 1.057–1.080.
Harlequin Duck
Dense Body Under Fast Water
Diving • Bottom-walking • Absorbing
Continuous work inside turbulence makes this a mid-frequency system.
Harlequin Filefish
Coral-Polyp Picker That Smells of Coral
Polyp-picking • Paired • Diurnal
That makes it a bimodal system: steady daytime polyp-picking and a still night hidden inside the same coral.
Harlequin Tuskfish
Reef-Jawed Signal Hunter
Visible • Controlled • Targeted
This produces a mid-frequency operating pattern: a conspicuous body moving through the reef with ongoing, measured effort and frequent, precise applications of force.
Harnessed Moth
Answering a Bat With Noise
A pair of ridged structures on the thorax buckled rapidly to produce trains of ultrasonic clicks • Those clicks emitted in response to a bat's own calls, at the moment the bat is closing in • The returning echoes disrupted so the bat's final approach is misjudged and the attack is broken off
Because the clicks run at very high rates, it operates as a high-frequency system.
Harp Sponge
Hooked Vanes Snagging Drifting Prey
Anchored • Snaring • Digesting
It is a low-frequency system.
Harpy Eagle
Short-Wing Canopy Snatch
Perched • Listening • Hours
Because it cannot function without both the long wait and the brief strike, it is a bimodal system.
Harris's Hawk
Relayed Flush and Ambush
Stacked perching • Leapfrogging • Watching one another
Because a continuous coordinated formation funds a rare and disproportionately expensive pursuit, this is a bimodal system.
Harvestman
Detachable Leg Stilts
Stilted • Slow • Shedding
That makes it a low-frequency system: slow, cheap and built on distance and sacrifice rather than on defence.
Hawaiian Crow
Sticks and Fruit in an Island Forest
Fruit-eating • Foraging • Dispersing
The system is bimodal: broad forest foraging and a slower, deliberate tool-using mode.
Hawksbill Sea Turtle
Narrow-Beak Sponge Extraction
Probing • Reef-bound • Continuous
Because feeding runs as a steady continuous search rather than in bursts, it is a mid-frequency system.
Hazel Dormouse
Seasonal Torpor Scheduler
Hibernating • Power-sparing
Because survival depends on this deliberate seasonal and daily switch between deep rest and measured activity, the hazel dormouse is a bimodal low–mid frequency system.
Hazel Leaf-roller Weevil
Pre-rolled Leaf Cradle
Rhythmic • Constructive • Site-led
That makes this a mid-frequency system built on rhythmic, repeated construction rather than extreme hoarding or single explosive events.
Head Louse
A Claw Cut to Hair
Each leg ending in a curved claw that closes against a thumb-like spur on the tibia • The gap between them matching the diameter of a human head hair almost exactly • The insect gripping individual shafts so firmly that combing, washing and scratching do not dislodge it
Because feeding recurs every few hours, it operates as a mid-frequency system.
Hecale Longwing
Pollen-Fed Adult Longevity
Trap-lining the same flowers • Kneading pollen into a drop • Living for months
Since the circuit repeats at one unhurried daily tempo, it operates as a mid-frequency system.
Hellbender
Skin-Fold Cutaneous Respiration
Flattened • Absorbing • Sedentary
Because the whole system is built on remaining still in a specific place, it is a low-frequency system.
Helmeted Chameleon
Highland Body-Warmed Gestation
Retaining • Basking • Live-bearing
Long retention, daily basking and a slow reproductive turnover make this a low-frequency system built on holding and warming rather than on speed.
Helmeted Curassow
A Casque Above a Very Low Voice
Walking • Booming • Rarely breeding
Slow-moving, low-density and slow-breeding, it is a low-frequency system throughout.
Helmeted Guineafowl
Running Rather Than Flying
Walking • Flocked • Deafening
That makes it a mid-frequency system: steady, sociable ground-covering with continuous collective vigilance.
Helmeted Hornbill
Solid Casque Aerial Jousting
Jousting • Calling • Canopy
Because the day runs as a steady canopy cycle, it is a mid-frequency system.
Hercules Beetle
Two Years of Wood, One Horn
Tunnelling • Converting • Growing
That makes it a bimodal system: a long, cheap, hidden accumulation and the short expensive contest it exists to pay for.
Hermann's Tortoise
Mediterranean Sun-Paced Forager
Thermal • Pacing • Shelter-led
Because its whole system is built around slow, conservative, thermally gated movement instead of bursts or distinct alternative modes, Hermann's tortoise is a single low-frequency system.
Hermit Crab
A Queue That Moves Together
Crabs gathering around a newly available shell that is too large for any of them • Lining up by size from largest to smallest beside it • Every crab swapping simultaneously the moment the largest moves in, so one shell rehouses the whole line
Because shells appear rarely, it operates as a low-frequency system.
Herring Gull
A Red Spot That Releases Food
Carrying a red spot on the lower mandible • Having it pecked by chicks that respond to the mark rather than the parent • Regurgitating food in response to the pecking
Since exchanges recur within seconds, it operates as a high-frequency system.
Hieroglyphic Cicada
Singing Nobody Can Locate
Males aggregating in the same trees and calling at the same time rather than spacing out • Overlapping calls merging into a continuous wall of sound with no clear origin • Any individual made harder to locate because the acoustic field cannot be resolved into sources
Because the call cycles hundreds of times a second, it operates as a high-frequency system.