To begin, set up the equipment for tattooing. Place the anesthetized frog on its back on a dry, unbleached paper towel. Using a dry, lint-free wipe, clear the water and mucus from the frog's chest.
Then find the sternum in the center of the frog's chest with fingers, and using the non-dominant hand, hold the skin taught. Position the assembled tattoo gun vertically relative to the working surface and dip the needle into the ink. Keeping the gun vertical, press the needle tip onto the frog's skin, followed by the foot pedal.
Draw lines onto the frog's skin while applying even pressure. If the needle gets stuck, clear excess ink or skin from the needle with a wipe. If necessary, clear excess ink on the frog's chest with frog-safe water and a wipe, and then wick away moisture with a dry wipe.
Continue to ink the same area until dark, legible numbers persist after wiping away excess ink. Fill a tank with 10 to 15 liters of fresh frog-safe water and add a styrofoam island to provide a surface for the frog to wake up without drowning. Wet a paper towel with frog-safe water and place it flat on the styrofoam island.
Next, lay the frog belly down on the towel facing the water. Fold half of the paper towel over the back half of the frog, and using cupped hands, wet its top portion. After 24 hours, when the tattoo is healed, return the frog to its long-term housing unit.
Of the frogs tattooed, 100%had visible tattoos immediately after tattooing, 100%had them 24 hours after tattooing, and 91%had them four months after tattooing.
