One bird becomes a cloud of differences. Four plain steps, turning on a loop — this film walks each one.
A species is a cloud of differences. Watch the caliper sweep the row: every beak measures differently.
Beak depth runs in families — the dots stream from parents to chicks all scene long.
One elephant pair, Darwin reckoned: about 19 million descendants in 750 years — if every single one survived.
Food, predators, disease, weather — pressing in all scene long. Watch the crowd thin.
Daphne Major, 1977: the drought burns off the small soft seeds. Only large, hard ones remain.
The Grants banded every bird. The 1978 distribution sits right of 1976: beak depth rose about 5% in one generation.
No finch changed its own beak. The cloud itself slides: small-beaked birds gone, large-beaked chicks remain.
The drawing keeps growing, the way the family tree did: populations drift apart into species.
Colonists keep arriving, wave after wave; each island keeps its own beak.
Individuals don't stretch into new shapes. There is no ladder, and no destination — the loop has no aim.
Variation, inheritance, struggle, selection — four steps on a loop that has never once stopped turning.