Chikchan, the serpent, is fifth of the twenty, following K'an the seed: after the seed goes in, the force that pushes up through the body. The Maya serpent isn't Eden's — it's life-force (grouped with the spine, with blood, with the lightning of the rainy season), and it's also K'uk'ulkan the feathered serpent, the passage between sky and earth.
So Chikchan's mechanism is instinct and vitality: the body knows first and the head catches up. Its power is directness — no detour, no deliberation, just felt; its difficulty is directness too — instinct is accurate and reasonless, and treating it as evidence goes wrong.
Where you'll recognise it: strong intuition, quick bodily reactions, unexplained likes and dislikes about people that later prove right, energy that swings and swings widely. Running well, you're the most alive: warm, real, magnetic, enough energy to share. Stuck, instinct runs you — impulsive, feeling mistaken for judgement, or a body suppressed until it acts up. In the sequence Chikchan is followed by Kimi, death: after the force peaks comes letting go. Your next step isn't pushing harder. It's knowing when to let this force pass.