Animal ID
/Natural History/Animal Life Cycle & Growth
Explore Taxon:
Avian Altricial Ontogeny

Red-tailed Hawk
Buteo jamaicensis

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.

Avg Wild Lifespan
15 Years
Typical in habitat
Max Documented
32.5 Years
Record longevity
Peak Daily Gain
25 to 35 grams per day
Growth velocity
Aging Pattern
Gradual Aging
Senescence curve
Red-tailed Hawk
Taxonomic Hierarchy
Accipitriformes / Accipitridae
1

Interactive Lifespan & Growth Scrubber

Drag the slider or click any milestone step to observe dynamic biometrics and physiological changes.

🐣
Active Life Stage
Newborn Eyas
🐣 Birth / Day 0Selected Age: Hatch (Day 0)πŸ‘‘ Full Maturity & Maximum Longevity
LengthRange
8 – 12 cm
Peer-reviewed anatomical bounds for this developmental bracket.
Body Mass RangeEstimated
50 – 65 g
Velocity: Gains 25–35 g / day
Reproductive Maturity0%
Juvenile pre-pubescent phase
Predation Vulnerability
Critical (High Predation)
Survival probability relative to adult predation apex status.
🌿Dietary Intake & Nutrition at Hatch (Day 0)

Shredded vole and rodent meat.

🐾Behavior, Locomotion & Ecology

Nest-bound; chirps for food.

Key Developmental Milestones at this Stage:
Hatches after 30-day incubation
Scientific Note on Precision: Growth values are approximate biological ranges derived from field and veterinary records. Exact size varies by sex, population genetics, nutritional availability, climate, and health.
2

Taxon-Specific Life Stage Machine

How Red-tailed Hawk progresses through distinct morphological phases.

🐣
Stage 1

Eyas / Downy Nestling

0 - 6 Weeks

Hatches in high cliff or tree crown nest. Both parents hunt mice and snakes to feed hungry brood.

Anatomical Highlights:
  • β€’First down replaced by dense secondary thermal down
  • β€’Talon sheath keratinization
  • β€’Rapid binocular eye development
Ecology: Nestling competitor; eats 100g of meat daily.
πŸ¦…
Stage 2

Immature Brown-Tail (Year 1)

6 Weeks - 18 Months

Brown banded tail (lacks red tail). Wanders open fields practicing thermal soaring and perch-hunting.

Anatomical Highlights:
  • β€’Juvenile flight feathers longer than adult feathers to assist early lift
  • β€’Brown striped tail plumage
  • β€’Iris turns from gray to amber
Ecology: Field rodent predator.
πŸ‘‘
Stage 3

Adult Brick-Red Tail

2 - 25+ Years

Iconic brick-red tail feathers, piercing raspy scream, and master thermal dynamic soaring ability.

Anatomical Highlights:
  • β€’Brick-red tail retrices molt in at second autumn
  • β€’Dark brown iris and yellow cere
  • β€’1.4-meter soaring broad wings
Ecology: Keystone open-country predator of snakes, voles, and rabbits.
3

Growth Timeline Reference Matrix

Standardized peer-reviewed biometric development data.

Age MilestoneLife StageLength RangeBody Mass RangeMaturityDietary Regime
🐣Hatch (Day 0)Newborn Eyas8–12 cm50–65 g0%Shredded vole and rodent meat.
πŸ¦…6 Weeks (Fledging)Fledgling Hawk110–135 cm950–1350 g10%Whole mice, rats, snakes, lizards.
πŸ‘‘2+ Years (Adult Red Tail)Prime Red-tailed Adult120–145 cm1000–1500 g100%Cottontails, squirrels, voles, rattlesnakes.
Growth Velocity Profile
Peak Expansion: Hatch to 6 Weeks
Proportion at Birth: Hatch weight is ~4.5% of adult mass
Sexual Dimorphism & Human Scale
Male vs. Female: Females (1.2–1.6 kg) are roughly 25% larger than males (0.9–1.2 kg).
Scale: Wingspan of 1.2 to 1.45 meters (nearly as wide as a human is tall)
Developmental Breakthroughs

Key Milestones in the Life of a Red-tailed Hawk

πŸͺΆ6 Weeks

Fledging

Leaves aerie on first soaring flight ride on wind thermals.

πŸ‘‘18 Months

Red Tail Molt

Sheds striped juvenile tail for brilliant red adult feathers.

Frequently Asked Questions About Red-tailed Hawk Life History

Scientific answers to high-intent queries regarding lifespan and growth.

Young hawks do not have a red tail! They have a brown-banded tail until their second summer (around 14–18 months old), when their signature red tail feathers molt in.

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