“Yes, that’s a spiger,” Andy said. “They grow as big as a pickup truck and can jump thirty-five feet or more and swallow a man whole." - Pandemonium

Spigers are named using a combination of the words "Spider" and "Tiger". They grow from Henders Rats that are fed by other Rats in times of abundance. They have bony plates and fur covered in iridescent stripes of pink and orange. Like most of the fauna of Henders Island, they are highly aggressive predatory carnivores.

Spigers, if injured, will be killed in a feeding frenzy like all Henderian fauna. Geoffrey speculates that Spigers developed as a food depositories for the Rats, forced to prey on macrofauna due to their size.