01 Fatten at flowers
Trapline or defend a patch until mass allows a crossing or a night.
Darker cells mean a higher score for this topic on that metric.
Speed91
Intelligence48
Range58
Resilience73
Cultural impact34
Ecological role76
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Quick answers
How can a hummingbird hover when other birds cannot?
The shoulder allows a nearly horizontal figure-eight. Lift on the upstroke as well as the downstroke pays the hover bill that a typical avian stroke cannot.
Do hummingbirds live on sugar water alone?
No. Nectar is fuel. Arthropods supply protein, especially for chicks. Feeders that omit insects do not replace a territory.
How does a 3-gram bird cross the Gulf of Mexico?
Ruby-throated hummingbirds fatten, then fly 800+ km nonstop. Tailwinds and a high mass-specific power output make the crossing possible, not a rest on ships.
What is torpor in hummingbirds?
A controlled drop in body temperature and metabolic rate overnight. Without it, many species would exhaust nectar stores before sunrise.
Are hummingbirds only tropical?
Diversity peaks in the Andes. Anna’s hummingbirds now winter in Vancouver gardens; ruby-throated breed to southern Canada.
Who first illustrated hummingbirds for Europe?
John Gould’s 19th-century monographs and skins made trochilids a Victorian craze — with a collecting cost that modern field work still cites.
Operating a hummingbird life is a loop: sense, decide, act, and stay inside an energy and legal envelope.
Steps are type-level -- hunt, migrate or spawn -- not a promise that every individual follows the same film sequence.
Principles
Energy in, work out
Nectar sugars plus insect protein. Hovering is among the costliest vertebrate gaits; torpor is the nightly rebate.
Information before motion
Colour vision into the near-ultraviolet helps flower finding. Spatial memory of traplines is the cognitive load.
Replacement rate
Slow breeders (whales, apes, albatrosses, tigers) cannot outrun a short political cycle. Fast clutch species still fail if the nest site vanishes.
Place is part of the phenotype
A hummingbird without its lake, ice, anemone or gravel is a different, usually failing, animal.
Human systems are now habitat
Quotas, feeders, reserves and films rewrite survival as much as weather. Gram-scale fat stores and weather windows bound migration. Island endemics have nowhere to shift when scrub is cleared.
Diagrams
Hummingbird forage / hunt loop
Locatesense
Approachmove
Strikeact
Handlehandle
Feed younginvest
Disperseleave
Hummingbird life-cycle loop
Pairstart
Nestgrow
Incubatemove
Fledgelearn
Migratebreed
Returnend
Life-cycle steps
02 Hover and lick
Tongue grooves wick nectar faster than suction myths claim.
03 Hawk insects
Protein for eggs and chicks comes from midges, not syrup.
04 Enter torpor
Overnight metabolic collapse if the larder is thin.
05 Migrate or altitudinal shift
Ruby-throated cross water; Andean species track blooming upslope.
06 Nest on a fork
Lichen-and-silk cups hold two pea-sized eggs.
Hard limits
Physiological envelope
Gram-scale fat stores and weather windows bound migration. Island endemics have nowhere to shift when scrub is cleared.
Place dependence
Without the breeding site or forage pulse, brochure behaviour is theoretical.
Human and legal limits
Quotas, listings and trade rules now bound real populations as tightly as weather.
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