Every blue whale is a stack of tissues that must agree under season, prey and human pressure.
Meters below repeat the six atlas scores as gauges; they are relative marks, not laboratory certificates.
Systems
Support and integument
A rorqual with ventral pleats, a 3 m heart in the public myth (the real heart is smaller than the postcard), and baleen for krill. Size is a filter-feeding outcome.
Feeding apparatus
Lunge-feeding on krill swarms -- the most expensive gulp, paid by the densest food. Fasting between polar summer and low-latitude winter. The feeding kit sets the ecological-role score relative to the other 23 types.
Respiration and circulation
Gas exchange and blood flow are tuned to the blue whale energy budget -- dive, hover, sprint or bulk browse -- not to a generic vertebrate template.
Senses and neural control
Low-frequency sound that crosses basins. Eyes are secondary in that budget.
Reproduction and ontogeny
Replacement rate is the hidden resilience number. A 1966 lock on a emptied south, and ships on the healthier coasts. EN is still the species card.
Thermoregulation and salt/water
Climate and osmoregulation bound where a blue whale can close its daily budget. Field sites in the English-speaking world still measure that envelope first.
Relative meters
Hotspots
Primary weapon or tool
The bill, teeth, trunk, pouch or talon that field guides name first -- and that trade or conflict usually targets.
Energy store
Fat, cache, crop or bamboo hours that decide whether a season closes.
Natal or breeding site
A redd, eyrie, den, anemone or ice lair -- often a single-point risk (Izumi, Natron, Gir).
Sensory organ
Low-frequency sound that crosses basins. Eyes are secondary in that budget.
Human interface
Hunt, tourism, film or quota -- the surface where blue whale biology meets English-language law.
Tissues & materials
Keratin and integument
Feathers, fur, baleen or skin plates -- tissues, not metals. Moult and wear are the maintenance cycle.
Bone and cartilage
Load paths for stoop, lunge, knuckle-walk or hover. Marrow and pneumatic bone differ by family.
Muscle and tendon
The expensive tissue that speed and intelligence scores only hint at.
Fat, oil and glycogen
Stores that migration, fast and lactation spend. A market for those stores (oil, ivory, fin) is a historical threat.
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