Shift from incubator-style care toward secure exploration, natural vegetation, digging and age-appropriate independence as the eyes open and mobility accelerates.
Upgrade housing before climbing, digging or gliding makes the old container unsafe.
Eyes open does not automatically mean weaned.
Add natural movement, hiding, foraging and species-normal behavior.
At roughly four weeks, woodchuck eyes begin opening and the teeth are already well developed. The enclosure now needs to teach the body and brain how to be a ground-dwelling digger — not how to be a household pet.
Woodchucks are fully furred with developed teeth and become dramatically more active.
Wild young are mobile enough to play and forage near the den and are approaching natural weaning.
Wild woodchucks are normally independent by this age, though family association can persist until later dispersal.
Offer fresh pesticide-free vegetation similar to what the local species uses: grasses, clover, dandelion, plantain and other verified safe leafy browse. Natural greens should be refreshed often rather than allowed to wilt or soil. Keep formula changes gradual while self-feeding increases.
Fruit and garden vegetables can be small variety items, but a releasable marmot should learn to recognize fibrous local forage rather than living on sweet produce.
Woodchucks are generally solitary/territorial as adults even though young may remain in family groups for a time. Other marmots can be more social. Do not automatically combine unrelated juveniles or isolate a naturally social species without checking the biology of the exact Marmota.
For every species, minimize affectionate handling, talking and exposure to dogs/cats. Release readiness requires appropriate wariness of people and domestic animals.
Woodchuck-specific measurements are kept separate from broader marmot guidance because age, social structure, climate and release timing vary across Marmota species.
