The physical characteristics of Syrian hamsters (golden hamsters) are as follows:

I. Basic Physical Data
Body length: Adult individuals typically measure 12–20 cm. Males are mostly 15–18 cm, while females can reach 15–20 cm.
Weight: 80–200 grams (females are generally heavier). Females may exceed 200 grams during the breeding period.
Tail length: 1–3 cm, with some selectively bred varieties having more distinct tail shapes.
II. Differences Between Breeds and Growth Traits
Common golden hamsters: Body length 12–15 cm, weight 100–120 grams, with fur primarily golden-brown.
Selectively bred varieties (e.g., teddy bear hamsters): Body length 15–20 cm, weight 150–200 grams, with diverse fur colors.
Giant individuals: Rare artificially bred specimens can exceed 20 cm in length and weigh over 220 grams.
III. Comparison of Growth Stages
Baby stage (1 week old): Body length 4–5 cm, weight approximately 10 grams.
Rapid growth stage (3 months old): Gain 10–15 grams per week, reaching 80–100 grams by 3 months.
Adult stage (after 6 months): Body size stabilizes, with weight ranging from 120–200 grams.
IV. Special Considerations
Female hamsters, due to reproductive needs, are usually 20%–30% heavier than males.
A weight below 80 grams may indicate malnutrition, requiring dietary adjustments.