Frequency signatures: Rock Hyrax to Rufous Elephant Shrew
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 1.777–1.800.
Rock Hyrax
Borrowing Warmth From the Colony
Huddled • Basking • Warming
That makes it a bimodal system: long passive warming and brief guarded feeding.
Rock Ptarmigan
Season-timed Plumage Cycle
Slow • Cyclic • Background-led
This is a low-frequency system: a dense, patient, season-locked cycle that spends energy on infrequent, whole-body updates rather than constant rapid adjustments.
Roe Deer
Delayed Implantation Timing
Paused • Timed • Annual
Because the annual cycle runs steadily, it is a mid-frequency system.
Roloway Monkey
Beard-Flash Canopy Contact
Grouped • Signalling • Daily
Because the system runs on constant low-cost signalling and steady daily foraging, it is a mid-frequency system.
Rook
Shared Rookery Nesting
Colonial • Flock-fed • Synchronised
That makes the rook a mid-frequency system: rhythmic, networked and dependent on numbers doing what one bird cannot.
Roosterfish
Swim-Bladder Horns Into the Ear
Surf-running • Loud-water • Committed
Short violent pursuits in shallow broken water make this a single high-frequency system.
Rose-ringed Parakeet
Communal Roost Information Exchange
Feeding out in small parties • Returning to one roost • Following whoever fed well
Since the feeding and the assembling repeat on one daily cycle, it operates as a mid-frequency system.
Roseate Spoonbill
Touch-Triggered Spatula Snap
Wading • Sweeping • Snapping
Continuous rhythmic sweeping makes this a mid-frequency system.
Roseate Tern
Hover-and-Plunge Dive
Hovering • Plunging • Repeated
Because returns come from many repeated modest dives, it is a mid-frequency system.
Rosy Maple Moth
Non-Feeding Adult Sprint
Brief • Unfed • Reproductive
That makes the adult a high-frequency system: short-horizon, fully committed and spending a fixed store as fast as it usefully can.
Rosy Tetra
Nearest-Neighbour Shoal Matching
Holding spacing • Matching heading • Turning with the neighbour
Because the matching is continuous and never pauses, it operates as a mid-frequency system.
Rough Keyhole Limpet
Rock-Homing Suction Foot
Anchored • Routine • Tidal
Because its feeding, safety and movement are all organized around this repeated grip-and-return cycle rather than continuous roaming or bursts, its whole biology expresses a low-frequency system built on stable anchoring and rhythmic reuse of the same hold.
Rougheye Rockfish
Cold-Slope Slow-Maturing Live Bearer
Slow-growing • Sheltering • Long-lived
Because its output is spread thinly across decades of slow growth and repeated breeding, with little spent on movement, the rockfish is a single low-frequency system.
Rove Beetle
A Toxin From Lodgers
A bacterial symbiont living inside the beetle producing pederin, a compound the insect has no genes to synthesise • That toxin held in the body fluid, so crushing the beetle releases it onto skin • Blistering dermatitis developing hours later at the site, from a beetle that never bit or stung anything
Because encounters are sporadic, it operates as a low-frequency system.
Royal Antelope
Understorey Freeze and Bound
Frozen • Browsing • Crepuscular
Because a small body takes many small meals and relies on stillness between them, it is a mid-frequency system.
Royal Flycatcher
Understory Crest Trigger
Hidden • Still • Blended
Because the whole system is built around long periods of low-key, camouflaged operation punctuated by rare, high-intensity visual bursts, the Royal Flycatcher is best understood as a bimodal system with a low baseline and a high-frequency display mode.
Ruby-throated Hummingbird
Torpor-Funded Hover Day
Hovering • Precise • Expensive
That makes it a bimodal system: an extremely expensive daytime mode and a near-shutdown at night.
Ruddy Daggerwing
A Second Head Behind
Long thin tails projecting from the hindwings that resemble antennae • Dark lines on the closed underside converging towards those tails as if towards a head • A strike directed at that end removing a piece of wing while the butterfly leaves in the opposite direction
Because attacks are occasional, it operates as a low-frequency system.
Ruddy Darter
Perch-loop Ambush Circuit
Rhythmic • Patrol • Reset
This creates a mid-frequency operating pattern: rhythmic, repeatable cycles of moderate expenditure anchored by a recurring perch.
Ruddy Ground Dove
Soil-Matched Stillness
Cryptic • Still • Ground-gleaning
That makes it a low-frequency system: quiet, economical and dependent on not being detected at all.
Ruddy Shelduck
A Pair That Stays Together
Paired • Defended • Distant
That makes it a mid-frequency system: steady, coordinated and paired.
Ruff
Lek Morph Costume Engine
Forage • Roost • Regroup
Because the species depends on both the ongoing wet-meadow routine and the concentrated arena-display bouts, with a clear rise in tempo when the lek is active, the Ruff operates as a bimodal system with a mid-frequency baseline and a high-frequency display mode.
Ruffed Grouse
Wing-Beat Drumming Stage
Drumming • Staged • Low-frequency
That makes it a mid-frequency system: rhythmic and repeated, built around a signal that reaches through cover the bird never leaves.
Rufous Elephant Shrew
Pre-mapped Runway Network
Hidden • Mapping • Maintenance
This makes their system bimodal: a dominant low-frequency mode of route maintenance and cautious foraging, and a high-frequency mode of explosive, pathway-bound sprinting when danger or movement demands it.