Anything that happens in order is always rrrr (first), mmrrr, rm, mmm.

1. Reveal Card.
   • Biome. Everyone gets a gene (if Sex, 2).
     1. Place biome per
        1. Latitude
        2. Type: Orogeny limited to mountains, rain shadow is moved to share hex with it, displacing whatever was there.
        3. Lowest climax (empty slots count as zero climax).
        4. Location: southern and western slots are favored.
        5. If new climax is lower than all legal slots, biome goes extinct.
        6. Biome is rotated to fill remainder of space in hex (i.e. add up to 4).
     2. Displace native biome
        1. to empty slot 1 hex away
        2. if none available, it goes extinct.
        3. prefer southern and western directions
        4. adjust biomass for moisture preference (wet likes wet, etc.)
   • DNA is Auctioned, ties to more teeth of type specified.
   • Genotype is Auctioned, ties to more teeth specified by current Greenhouse Level.
   • Immigrant.
     1. If card says Genetic Drift, players must discard a card.
     2. If bridge closed, it waits wait until the bridge opens, otherwise
     3. Find type: 6-letter immigrants are herbivores, 1-letters predators
     4. Find first compatible biome:
        • Immigrants do not compete with existing immigrants.
        • May change W to needed DNA only if strictly necessary.
        • Herbivores do not seek H unless they have H.
   • Catastrophe. Everyone gets 5 genes (if Sex, 10).
     • Greenhouse level changes. Move each biome to follow land, marine or ice arrow depending on type.
       • If Up, start at top left and go across each row, moving each biome north.
       • If Down, start at bottom right and go across each row, moving each biome south.
     • If the Catastrophe opened up a bridge and there were immigrants trapped behind it, bring those immigrants on now. See Immigrant above.
     • The 4 Pandemics cause loss of a genotype (if you have more than one) if you are the player with the fewest genes.
     • The 4 Bolide Catastrophes:
       • The Comet (Mesozoic) kills any genotype with > 3 AaBGMS or with SSS.
       • The Asteroid (Cenozoic) kills > 2 AaMS or BBB.
       • The Supernova (Cenozoic) kills > 4 AaMNS or III.
       • The Solar Flare (Cenozoic) kills > Size 4 or AAA or aaa.
2. Express Cards (in order if requested).
   • DNA Add to an available Genotype slot.
   • Genotypes
     1. Trigger a Milankovich Cycle change. (see on-map chart)
     2. Choose genotype to inherit from.
     3. Replace one of its counters with a counter of the new type.
     4. Place the genotype card on a legal size.
     5. Give it every DNA counter that its parent had (excepting size restrictions and incompatibilities).
3. Recess DNA Cards. Remove DNA counters from genotype cards using them. May not recess genotypes.
4. Size, Trophic Level and Hand Adjust (each player does all three, in order).
   1. Decide whether to be herbivore or predator. If changing, all counters must change except in case of mmm omnivore.
   2. Change Size by 1 Level. (Predators must be same size or up to 2 sizes smaller than their prey.)
   3. Discard cards so as to only hold as many cards as you have genotypes.
5. Population Expansion. In every biome/triangle where you have counters, place another.
6. Migration.
   1. Herbivore Migration (in order). Wings move 3 hexes. No movement into all sea hexes without M or wings. Need PP to cross Ice. Need wings to cross flooded bridges.
   2. Predator Migration and Predator Final Size Adjust (in order). Change size by 1 level.
7. Extinctions.
   1. Herbivore Extinctions. In every biome, keep applying extinction rules until the biome is not over its biomass capacity.
      1. Niche winners survive.
      2. Any herbivores inedible to all predators in the triangle survive. Inedibility occurs if predator
         • is not the right size to consume prey, or
         • has fewer S or N than prey, or
         • has fewer A than prey has a, or
         • is the same counter type as prey (cannibalism).
      3. If there is only 1 type of predator and that predator can predate all herbivores in the biome, then the predator decides who survives (game warden).
      4. Herbivores with the most teeth survive.
   2. Predator Extinctions. Predators choose qualifying prey Predators without prey go extinct. Order of choice is by
      1. Larger predators choose before smaller.
      2. Fewer teeth choose before more teeth.
   3. Cleanup. Genotypes with no population on the board
      1. discard their genotype card
      2. discard any exclusive DNA cards
      3. move any non-exclusive DNA cards in their column to the column of a genotype using them, even if this slot is already full.
8. Sanity Check. Players should double-check from time to time the following:
   • No hex has a biomass capacity of more than 4
   • No biome has more herbivores than biomass capacity
   • No predator is unable to consume its prey due to size
   • No predator is unable to consume its prey due to roadrunner DNA