Savannah monitor: what a study on its digestion changes about feeding frequency
Published by Planète Pets · managing editor: Clément Lacaille · how our guides are written
The savannah monitor (or Bosc's monitor, Varanus exanthematicus) has a reputation for a hearty appetite, but a study tracked precisely what happens inside its body after a large meal, with direct implications for the feeding rhythm to follow. Our feeding guidance is gathered in the reptile food section.
A study on digestion in the savannah monitor
Hartzler, Munns, Bennett and Hicks published a study in 2006 in the Journal of Experimental Biology on the metabolic and blood gas dependence on digestive state in the savannah monitor lizard (Varanus exanthematicus), through measuring the "alkaline tide" that accompanies digestion (see the study). After a meal worth roughly 10% of the animal's body mass, the researchers measured oxygen consumption, carbon dioxide production, and blood parameters every eight hours for five days, and observed a metabolic peak reached only around the 40th hour after the meal.
What this changes about feeding frequency
This digestion timeline, measured over several days, explains why a monitor fed too often never really gets to finish a full digestive cycle before the next meal arrives.
- Space an adult's meals several days apart (two to three times a week) rather than feeding daily, to respect this digestive cycle spread over nearly two days.
- Avoid handling the animal in the hours after a meal, since digestion is already drawing on a significant share of its physiological resources.
- Adjust prey size rather than feeding frequency to control calorie intake, since a meal that is both too large and too frequent is the main driver of obesity in this species.
This feeding caution builds on the practical guidance in our article on tracking a reptile's weight on a scale, a valuable tool for objectively spotting weight gain in a species prone to obesity, and pairs with our study on exercise metabolism and enrichment in the savannah monitor.
Frequently asked questions
Should a young savannah monitor be fed as rarely as an adult?
No, a growing juvenile needs more frequent meals; it is mainly in adults, once growth is complete, that spacing out meals becomes essential to prevent obesity.
How long after a meal can the animal be handled again?
The study suggests waiting at least 48 hours, since the digestive metabolic peak occurs around the 40th hour; it's best to let this cycle finish before any extended handling.
Can an obese savannah monitor return to a normal weight?
Yes, generally, through spacing out meals and gradually reducing prey size, under exotic-vet supervision if the excess weight is significant. Find all our guides on the reptile hub.
See it in the Planète Pets shop: Stick-on digital thermometer for aquarium and terrarium glass (€18.90) · the whole shop
This guide is part of Planète Pets’s Reptiles universe. Our advice is general in nature: for any health concern, your veterinarian remains the only reference.