Frequency signatures: Stick Insect to Sumatran Tiger

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 2,017–2,040.

Stick Insect

LOW

Camouflage That Needs Total Stillness

Holding a twig-like posture for hours • Swaying slightly as if in wind • Feeding only in darkness

Since the cycle turns over across a season, it operates as a low-frequency system.

Stick Mantis

LOW

Moving as a Branch

An extremely elongated body with leaf-like flanges and irregular projections breaking the outline • The insect rocking gently from side to side while stationary rather than holding perfectly still • That movement matching what surrounding vegetation does in moving air, so stillness in a moving background would be the thing that stood out

Because the sway is continuous, it operates as a low-frequency system.

Stick Mimic Assassin Bug

HIGH

Plucking Silk to Call

The bug entering a spider's web on thread-thin legs and plucking the silk with its forelegs • Those vibrations reproducing the pattern a trapped insect makes, which is the signal the spider is built to respond to • The spider approaching its own trap expecting prey and being seized, so the predator is brought to the hunter rather than stalked

Because the plucking runs at high rates, it operates as a high-frequency system.

Stilt Bug

MID

Walking Over Glue on Stilts

Extremely long slender legs holding the body well clear of the leaf surface • Only the small tips of the feet in contact at any moment, and those moved deliberately and slowly • Progress across sticky glandular hairs that trap and kill insects with ordinary leg contact

Because the movement is continuous, it operates as a mid-frequency system.

Stoat

HIGH

Photoperiod Coat Switch

Hunting • Constant • Unbanked

That makes it a high-frequency system: constant, unbanked and unable to pause.

Stoplight Loosejaw

HIGH

Red-Beam Stealth Optics

Focused • Stealth • Strike

That combination of covert sensing and rapid, low-drag attack makes this a high-frequency system built around brief, stealthy opportunities in an otherwise quiet environment.

Straw-headed Bulbul

LOW

A Song That Emptied Forest

A loud rich bubbling song delivered from riverside vegetation and audible at a distance • That song prized above almost any other in the Southeast Asian songbird trade and in competitions • Trappers locating and taking birds by the song itself, so the trait that defines the species is what removes it

Because the decline runs across years, it operates as a low-frequency system.

Strawberry Hermit Crab

LOW

Sea-Filled Shell on Dry Sand

Sheltering • Buried • Water-holding

That makes it a bimodal system: daytime shelter and nocturnal scavenging.

Strawberry Poison Dart Frog

MID

Honesty Bought From Mites and Ants

Calling • Eating tiny arthropods • Carrying tadpoles

Constant daytime calling, feeding and tadpole care makes this a mid-frequency system.

Streaked Gurnard

MID

Fin Rays That Taste

The lowest three pectoral fin rays on each side detached and free-moving • Those rays used to walk over the bottom and to probe the sediment • Chemoreceptors on them detecting buried prey by taste before anything is seen

Because searching is continuous, it operates as a mid-frequency system.

Striated Caracara

MID

A Falcon That Forages on Foot

Scavenging • Walking • Investigating

Because the system is a steady daily round of ground foraging, it is a mid-frequency system.

Striped Albatross

MID

Two Forms for Two Seasons

Developing in the wet season with broader dark markings • Flying in cooler cloudier conditions • Producing the form that most descriptions treat as typical

Applying the structural test, these are two developmental states, making it a bimodal system.

Striped Blister Beetle

LOW

Bleeding a Blistering Compound

Feeding openly on foliage in conspicuous stripes • Releasing haemolymph from leg joints when seized • Delivering cantharidin that blisters the skin of whatever grasped it

Since the cycle runs annually, it operates as a low-frequency system.

Striped Hyena

LOW

Marrow Sealed Inside a Bone

Ranging at night • Carrying bones home • Cracking them open

Solitary, wide-ranging and slow, this is a low-frequency system.

Striped Skunk

LOW

Advertised Musk Discharge

Ambling • Omnivorous • Unhurried

That makes the skunk a bimodal system: a cheap unhurried baseline holding one costly, deliberately advertised response.

Striped Snakehead

MID

Burrowing Into the Drying Mud

An active fish in standing water, breathing air at the surface, hunting and guarding young in the wet season

The two states are distinct architectures, so it operates as a bimodal system.

Sturgeon

LOW

Feeling the Bed With Barbels

Cruising just above the bed with a flattened snout lowered • Detecting buried prey with barbels and electroreceptors • Protruding a toothless tube-like mouth downward to suck it out

Since generations run in decades, it operates as a low-frequency system.

Sugar Glider

MID

A Membrane Wrist to Ankle

Launching from a high trunk with limbs spread • Gliding on a membrane stretched between fifth finger and ankle • Steering by altering the tension and landing head-up on the next trunk

Since glides recur through the night, it operates as a mid-frequency system.