Evolution Stages

Evolution Stages & Growth Mechanics

git-tulkun uses a logarithmic growth curve modeled to provide continuous, rewarding visual progression throughout the year.

The growth parameter $g \in [0, 1]$ is computed as:

$$g = \min\left(1.0, \left(\frac{\text{contributions}}{2800}\right)^{0.45}\right)$$

Stage	Contributions (`annual` or `rolling`)	Spine Length	Anatomical Features Unlocked
Stage 1: Baby Calf	`0 – 149`	$64\text{ px}$	Compact, rounded torso; blunt snout with a flat sensor dimple; pale cream dorsal swirl patches and stubby flippers with light cream caudal flukes.
Stage 2: Yearling Calf	`150 – 499`	$95\text{ px}$	Slender body profile; kuru neural whips sprout behind the anterior opercular flippers; caudal flukes darken at the base.
Stage 3: Adolescent Tulkun	`500 – 1,199`	$130\text{ px}$	Sensor crest organ begins elevating forward; all 6 pectoral and ventral flippers elongate with ivory leading edges; secondary pelvic accessory paddles widen.
Stage 4: Mature Tulkun	`1,200 – 2,499`	$160\text{ px}$	Charcoal carapace replaces juvenile dorsal swirls; sloped crimson sensor crest with an olive-gold tip; 5 sharp sawtooth jaw triangles.
Stage 5: Adult Male Bull	`2,500+`	$186\text{ px}$	Maximum leviathan length and full scythe-wing span; towering vertical hooked hammer-crest with concave rear overhang; 6 serrated jaw triangles; white carapace battle scars.

annual (Default): On January 1st, the contribution counter resets to zero, turning every user's Tulkun into a Baby Calf. This gamifies annual coding consistency.
rolling: Uses your trailing 365-day contribution total. Your whale reflects your active 1-year development pace without seasonal resets.