The short answer for a green tree python
A green tree python eats whole rodents and essentially nothing else. Coiled in its characteristic saddle posture over a branch, this python waits for mammals and birds to pass below, and captive feeding simply recreates that: a thawed mouse or rat, presented at dusk, taken from tongs. A green tree python does not need feeder variety the way an omnivorous lizard does, because a whole rodent delivers muscle, bone, organs, and gut contents in one complete package. What this python does need is discipline about size and spacing, since its wild meals arrive irregularly and its body is built to conserve, not to process a constant supply.
Why overfeeding is this python's biggest diet risk
A green tree python moves very little between meals, spending days on the same perch, so extra calories have nowhere to go. Keepers who feed an adult green tree python weekly because it strikes eagerly often end up with an obese snake, and obesity in this species is linked with serious complications including prolapse. Judge meal size by the python's body: prey about as wide as the snake's thickest point, leaving a visible but not dramatic bulge, is the working rule for a green tree python. Adults generally settle on appropriately sized rats every ten to fourteen days, juveniles on mice every five to seven days while they grow. Resist feeding a green tree python during a shed cycle if it refuses; a missed meal costs this species nothing.
Presenting a meal to a perch-hunting python
A green tree python hunts downward from its branch, so presentation should work with that angle. Thaw the rodent fully, warm it until it feels warm to the touch, and offer it with long tongs below and slightly in front of the python's coils after lights-out, when a green tree python naturally becomes alert. A gentle wiggle usually triggers the strike and the long constriction that follows; once the snake wraps, withdraw and leave it undisturbed. Feed a green tree python in its enclosure rather than moving it, since handling an arboreal snake off its perch before a meal adds stress without benefit. Never offer live prey to a green tree python unsupervised: a rat can badly wound a snake that decides not to strike, and thawed prey removes that risk entirely.
Reading a green tree python that will not eat
A green tree python refusing food is most often commenting on its setup, not the rodent. Check perches, humidity, and the day-night temperature drop this species expects, and confirm the snake is not approaching a shed, when many green tree pythons ignore meals. Watch for repeated regurgitation, which in a green tree python can signal prey that was too large or temperatures too cool for digestion, and for wheezing or mucus, which needs a veterinarian rather than a different prey item. A healthy adult green tree python can miss several scheduled meals without concern, but weight loss along the spine or refusal stretching across months deserves professional input. For keepers sharing this snake, KinsLe's Care Teams records each offered rat and its size, with the completed feeding timestamped for the next person on duty.