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| Age | Significant
Development | Development
Period | Growth
Period | Approximate
Weight (lbs.) | | Birth | - | Neonatal | Maximal growth | 0.5 - 1.0 | | 11 - 15 days | Eyes open | Transition | - | 3.5 | | 20 days | Hearing begins | Period of
Socialization | - | 7.0 | | 21 days | First emergence
from den | - | - | - | | 35 days | Weaning | - | - | 13.0 | | 8 - 10 weeks | Pups abandon den
& live in temporary
rendezvous sites | - | | 15.0-22.0 | | 11 weeks | - | Juvenile | - | 20.0-30.0 | | 14 weeks | - | - | Rapid growth | 25.0-45.0 | | 16 - 26 weeks | Milk teeth replaced;
winter pelage
becomes apparent | - | - | 28.0-70.0 | | 27 - 32 weeks | Pups travel with
the pack | - | Slow growth | 30.0-80.0 | | 1 year | Epiphyseal cartilage
closes | - | End of bone growth | 60.0-100.0 | | 22 months | Sexual maturity | Adulthood | - | - |
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