Tome's Spiny Rat

Fascinating facts about the Tome's Spiny Rat

• When a predator grabs a Tome's spiny rat, the animal can actually shed its tail, a defense seen in only about 30 rodent species worldwide. In wild populations, tail loss rates range from 8% to as high as 25%, but islands with fewer predators show lower percentages. Because mammals cannot regrow a lost tail, each shed is a one-time escape, making this rare autonomy a crucial survival trick for a rodent that often freezes in the open.
• A single adult can weigh up to 700 g, but most individuals sit between 300 and 400 g. Their head-and-body length spans 220-280 mm with a tail only 175-192 mm long, less than 90% of body length, and about one-quarter of adults lose their tails entirely.
• Home ranges swell dramatically with the rains: individuals occupy on average 1,260 m² in the wet season but shrink to about 740 m² when it dries. Overall territories can be as small as 180 m² or as large as 2,375 m², and total overlap between neighbors varies from 300 to 5,700 m².
• Females can breed up to four times a year, each litter holding as many as five precocial pups, but the timing hinges on fruit availability. On Panamanian islands, births surge when fruit is abundant and plunge during shortages, showing that food drives reproduction. Gestation lasts about 60 days, and newborns weigh roughly 30 g.
• These rats are seed-dispersal powerhouses, moving large seeds an average of five metres from the parent tree and sometimes over ten metres. They favor fruits with big seeds, like black palm and wine palm, and most seeds they carry are dropped intact, keeping them viable. By also spreading arbuscular mycorrhizal fungal spores, found in 77% of their feces, they help seedlings establish, making them key engineers of forest regeneration.

Sources

Every fact above was checked against these pages, and kept only where one of them states it.

• Animal Diversity Web
• Wikipedia

At a glance

About the Tome's Spiny Rat

In the dense, vibrant undergrowth of Central America's tropical forests, the Tome's Spiny Rat navigates with quiet purpose, its sturdy, compact body weaving effortlessly through the tangled vegetation as it forages for fruit, seeds, and tender shoots. With its distinctive, spiny fur fluffed against the damp air, this unassuming rodent moves with a quiet confidence, its large, dark eyes ever-vigilant for potential threats in its lush, verdant world. As it burrows and scurries through its domain, the Tome's Spiny Rat embodies a remarkable blend of adaptability and resilience, thriving in one of the most biodiverse ecosystems on the planet.

More mammals to discover

Browse Feravox