01 Claim a wetland
Unison calls and dances mark a territory before nest building.
Operating a crane 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
Omnivory in marshes -- plants, invertebrates, small vertebrates. Winter grain at Kushiro and Izumi is a human subsidy on that diet.
Information before motion
Visual pair displays and far-carrying calls structure territories. Wetland depth and ice decide winter survival more than acuity.
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 crane 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. A few winter basins and nesting marshes hold the Endangered type. Influenza and rice-paddy conversion are tighter than any sprint.
Diagrams
Crane forage / hunt loop
Locatesense
Approachmove
Strikeact
Handlehandle
Feed younginvest
Disperseleave
Crane life-cycle loop
Pairstart
Nestgrow
Incubatemove
Fledgelearn
Migratebreed
Returnend
Life-cycle steps
02 Mound nest
A vegetated platform sits above fluctuating water.
03 Two-egg clutch
Often one chick dominates; families travel as three.
04 Colts follow
Young walk and then fly the local commute.
05 Autumn gather
Migratory birds stage toward Korea, China or Izumi.
06 Winter stand
Ice, grain and flu risk set the off-season ledger.
Hard limits
Physiological envelope
A few winter basins and nesting marshes hold the Endangered type. Influenza and rice-paddy conversion are tighter than any sprint.
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.
Keep exploring
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Overall 58