How the board was scored
S through D compare observed cash roles for the same job: which hatches were worth a plot slot in the recorded sessions. Dragon is high because a session called it a top earner. Starter animals are low because they paid about $1 or nothing. Bat is omitted because readings span $3 to $200 per second. Wyvern is omitted from the letters because a $1.2 billion label appears on one illustration and the footage catalog never recorded its egg. Read the number on your own animal before you sell.
S tier
Player decision Keep a Dragon whose label is among your best. The +200,000 figure is one session, not a fixed rate, and a small or mini Dragon may pay less than the large one.
A tier
Player decision Keep it until you can read the cash label. Do not sell or keep it on the Secret word alone. A Polar Bear was called rare and still paid poorly.
Player decision Keep it while $156 beats your other labels. Sell it if you need millions for a gun and a stronger animal is ready to take the slot.
B tier
Player decision Keep it early. Replace it when animals over your cleanup line, about $50 in one session, need the slot.
Player decision Keep a Cobra that clears your current cutoff. The Legendary label on the Triple-Head variant is a collection note, not a measured rate.
Player decision Keep it while its label beats your cutoff. Do not keep it only because it is golden.
C tier
Player decision Unequip or sell it when the plot is full and a higher label is waiting.
Player decision Treat it as a filler. Sell it when you need the slot.
Player decision Do not protect a slot for the rare comment. Sell or keep based on the label you see.
D tier
Player decision Fine as a first animal. Sell or unequip it as soon as the plot blocks a better egg.
Player decision Replace it when any higher label needs the slot.
Player decision Sell it during the first cleanup.
Player decision Sell or unequip a $0 lizard immediately. It occupies a slot and does not pay.