Grizzly Bear
Ursus arctos horribilis
Explore the complete life journey from birth to maximum documented longevity. Move the interactive age slider below to see real-time biometric growth ranges, developmental milestones, metabolic changes, and ontogenetic stages.
Interactive Lifespan & Growth Scrubber
Drag the slider or click any milestone step to observe dynamic biometrics and physiological changes.
Milk.
Dependent early stage (earthen winter den).
Taxon-Specific Life Stage Machine
How Grizzly Bear progresses through distinct morphological phases.
Cub
Born tiny in a earthen winter den; grows rapidly on rich milk.
- •Altricial neonate
- •Growing milk teeth
- •Insulating fur
Yearling
Follows mother learning to find salmon & calves.
- •Rapid skeletal growth
- •Developing foraging skills
Subadult
Independent; still filling adult mass.
- •Near-adult frame
- •hyperphagia before denning
Prime Adult
Full size with seasonal fat cycles.
- •Adult dentition
- •Seasonal fat stores
Elder
Slower foraging; dental wear accumulates.
- •Worn teeth
- •Lower body condition risk
Growth Timeline Reference Matrix
Standardized peer-reviewed biometric development data.
| Age Milestone | Life Stage | Total Length Range | Body Mass Range | Maturity | Dietary Regime |
|---|---|---|---|---|---|
| 🐻Birth / Hatch / Day 0 | Cub | 20–30 cm | 0.3–0.5 kg | 0% | Milk. |
| 🐻Early growth | Cub | 39.2–56.4 cm | 15.9–43.6 kg | 12% | Roots, berries, insects with sow. |
| 🐻Mid juvenile | Yearling | 76–107 cm | 45.7–126.3 kg | 35% | Salmon, ungulates, plants. |
| 🐻Late juvenile | Subadult | 116–162 cm | 78.1–216.2 kg | 60% | Salmon, ungulates, plants. |
| 🐻Near maturity | Adult | 156–217 cm | 110.5–306.1 kg | 85% | Salmon, ungulates, plants. |
| 👑Prime adult | Prime Adult | 177–246 cm | 127.4–352.8 kg | 98% | Salmon, ungulates, plants. |
| 👑Later adult | Elder | 180–250 cm | 130–360 kg | 100% | Salmon, ungulates, plants. |
Key Milestones in the Life of a Grizzly Bear
Grizzly Bear Early Independence Skills
Critical early learning period unique to grizzly bear ecology.
Peak Growth Window
Spring emergence to age 4 is when size accumulates fastest.
Sexual Maturity
Typical maturity near 5 years for this species.
Adult Niche Mastery
Adults specialize in earthen winter den.
Diet Transition
Roots, berries, insects with sow.
Frequently Asked Questions About Grizzly Bear Life History
Scientific answers to high-intent queries regarding lifespan and growth.
