01 Territory advertise
Soaring display and vocal call mark a joint home range before nest repair.
Darker cells mean a higher score for this topic on that metric.
Speed84
Intelligence63
Range72
Resilience66
Cultural impact91
Ecological role73
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Quick answers
Why do bald eagles show a white head only as adults?
The white head and tail typically appear after four to five years. Juveniles are mottled brown, which reduced historical miscounts in winter surveys.
How fast is an eagle stoop compared with level flight?
Level cruising for large eagles is often 50–80 km/h. A hunting stoop is a different regime — trained golden eagles have been filmed above 240 km/h.
Did DDT almost erase North American bald eagles?
By 1963 the lower-48 count was about 417 nesting pairs. The 1972 DDT ban plus Endangered Species Act protection preceded the 2007 delisting.
Are “eagle” species one lineage?
No. “Eagle” is a grade inside Accipitridae. Sea eagles (Haliaeetus) and booted eagles (Aquila) split tens of millions of years ago.
Why is the Philippine eagle a different conservation story?
Pithecophaga jefferyi is a forest-interior endemic with perhaps a few hundred adults. Logging and shooting, not eggshell thinning, dominate the threat list.
Do eagles mate for life?
Many pairs are socially monogamous and reuse eyries, but extra-pair behaviour and mate replacement after nest failure are documented.
IUCN mix: LC→CR by species
Operating a eagle 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
Sit-and-wait on a commanding perch, then a short powered chase or a long stoop. Kleptoparasitism on ospreys saves hunt energy on salmon rivers.
Information before motion
A fovea dense with cone cells supports high-acuity prey detection at distance. Oil droplets and a pecten oculi are the usual avian optical extras.
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 eagle 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. Wing loading limits closed-canopy pursuit. Lead, rodenticides and turbine blades are modern ceilings that talons cannot solve.
Diagrams
Eagle forage / hunt loop
Locatesense
Approachmove
Strikeact
Handlehandle
Feed younginvest
Disperseleave
Eagle life-cycle loop
Pairstart
Nestgrow
Incubatemove
Fledgelearn
Migratebreed
Returnend
Life-cycle steps
02 Nest repair
Pairs add sticks to an eyrie that may already weigh hundreds of kilograms.
03 Incubate
Both adults share a 35–45 day sit depending on species.
04 Brood and feed
The first-hatched chick often dominates; Cainism is documented in several Aquila species.
05 Fledge
Young leave the nest after 10–14 weeks but still take transferred prey.
06 Disperse
Immatures wander river systems and coasts for years before first breeding.
Hard limits
Physiological envelope
Wing loading limits closed-canopy pursuit. Lead, rodenticides and turbine blades are modern ceilings that talons cannot solve.
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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