Black-necked Swan vs Red-breasted Merganser
How does the Black-necked Swan compare to the Red-breasted Merganser? They are both members of the Anatidae family. Below we put their classification, habitat, diet, size, and conservation status side by side — and settle who would win in a fight.


Side-by-side comparison
- Scientific name
- Cygnus melancoryphus
- Mergus serrator
- Classification
- Bird
- Bird
- Family
- Anatidae
- Anatidae
- Habitat
- Freshwater wetlands
- Freshwater and coastal wetlands
- Diet
- Herbivore
- Carnivore
- Conservation status
- Least Concern
- Least Concern
- Lifespan
- 10-20 years
- 8-13 years
- Weight
- 3.5–6.7 kg
- 800-1350 g
Black-necked Swan vs Red-breasted Merganser: who would win?

Black-necked Swan
3.5–6.7 kg

Red-breasted Merganser
800-1350 g
Black-necked Swan wins high confidence
Black-necked Swan is substantially heavier (3.5–6.7 kg vs 800-1350 g). In a physical confrontation that size and power advantage is usually decisive. In the wild these two rarely (if ever) meet — this is a what-if based on the size and diet we have on record, not a prediction.
Similarities
- Both are birds.
- Both belong to the Anatidae family.
- Both are listed as Least Concern.
Differences
- Habitat: Freshwater wetlands vs Freshwater and coastal wetlands.
- Diet: herbivore vs carnivore.
- Weight: 3.5–6.7 kg vs 800-1350 g.
Black-necked Swan vs Red-breasted Merganser: FAQ
Who would win in a fight, a Black-necked Swan or a Red-breasted Merganser?
Black-necked Swan wins. Black-necked Swan is substantially heavier (3.5–6.7 kg vs 800-1350 g). In a physical confrontation that size and power advantage is usually decisive. In the wild these two rarely (if ever) meet — this is a what-if based on the size and diet we have on record, not a prediction.
What is the difference between a Black-necked Swan and a Red-breasted Merganser?
Black-necked Swan and Red-breasted Merganser differ in several ways — habitat: freshwater wetlands vs freshwater and coastal wetlands. diet: herbivore vs carnivore. weight: 3.5–6.7 kg vs 800-1350 g.
Do Black-necked Swan and Red-breasted Merganser live in the same habitat?
No — Black-necked Swan lives in freshwater wetlands, while Red-breasted Merganser is found in freshwater and coastal wetlands.
What do Black-necked Swan and Red-breasted Merganser eat?
Black-necked Swan has a herbivore diet, while Red-breasted Merganser has a carnivore diet.
Which is more endangered, the Black-necked Swan or the Red-breasted Merganser?
Black-necked Swan is listed as Least Concern, while Red-breasted Merganser is listed as Least Concern.
How big are Black-necked Swan and Red-breasted Merganser?
Black-necked Swan weighs around 3.5–6.7 kg, while Red-breasted Merganser weighs around 800-1350 g.

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Black-necked Swan

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Red-breasted Merganser





