Emperor Penguin vs Fiordland Penguin
Put an Emperor Penguin (130 cm) beside a Fiordland Penguin (71 cm) and the penguin family stops looking like one interchangeable bird. Emperor Penguin: The Emperor Penguin is not built to defeat Antarctic winter. It survives by turning a breeding pair into a relay team, with the male becoming a walking incubator on sea ice. Fiordland Penguin: Fiordland Penguins look like crested rock specialists until they vanish into wet forest. Tawaki survive by being hard to reach and harder to read. Start with the table, then read what the gaps between those rows actually cost.
Emperor Penguin
Fiordland Penguin
Size Comparison
Emperor Penguin
100-130 cm
22-45 kg
Fiordland Penguin
51-71 cm
2.7-5.9 kg
| Feature | Emperor Penguin | Fiordland Penguin |
|---|---|---|
| Conservation | Endangered | Vulnerable |
| Scientific Name | Aptenodytes forsteri | Eudyptes pachyrhynchus |
| Height | 100-130 cm | 51-71 cm |
| Weight | 22-45 kg | 2.7-5.9 kg |
| Lifespan | 15-20 years | 10-20 years |
| Population | ~595,000 individuals | ~6,250 mature individuals |
| Diet | Fish, Squid, Krill | Squid, Crustaceans, Small fish |
| Habitat | Antarctic sea ice, Antarctic coastline | Temperate rainforest, Rocky coastlines, Dense vegetation |
| Regions | Antarctica | New Zealand (South Island), Stewart Island |
| Genus | Aptenodytes | Eudyptes |
Conservation Status
Emperor Penguin
EndangeredFiordland Penguin
VulnerableScientific Name
Emperor Penguin
Aptenodytes forsteri
Fiordland Penguin
Eudyptes pachyrhynchus
Height
Emperor Penguin
100-130 cm
Fiordland Penguin
51-71 cm
Weight
Emperor Penguin
22-45 kg
Fiordland Penguin
2.7-5.9 kg
Lifespan
Emperor Penguin
15-20 years
Fiordland Penguin
10-20 years
Population
Emperor Penguin
~595,000 individuals
Fiordland Penguin
~6,250 mature individuals
Diet
Emperor Penguin
Fish, Squid, Krill
Fiordland Penguin
Squid, Crustaceans, Small fish
Habitat
Emperor Penguin
Antarctic sea ice, Antarctic coastline
Fiordland Penguin
Temperate rainforest, Rocky coastlines, Dense vegetation
Regions
Emperor Penguin
Antarctica
Fiordland Penguin
New Zealand (South Island), Stewart Island
Genus
Emperor Penguin
Aptenodytes
Fiordland Penguin
Eudyptes
Key Differences
Not a second table — the reasons the numbers diverge.
Survival problem
Emperor Penguin: Everything about an emperor colony depends on stable sea ice lasting long enough for one chick to hatch, survive the coldest weeks of the year, and meet open water again before the platform breaks apart. Fiordland Penguin: They must move between rough surf and concealed forest nests while staying hidden from predators and human disturbance in a very narrow breeding window. Those two sentences are the comparison’s spine — stats only make sense if they map back to the problem each bird is actually solving.
Size and mass
The Emperor Penguin is nearly twice as tall on average — up to 130 cm and 45 kg against the Fiordland Penguin's 71 cm and 5.9 kg. That gap changes dive physics, fasting capacity, and how each bird spends energy on land and at sea.
Habitat logic
Emperor Penguins use antarctic sea ice and antarctic coastline; Fiordland Penguins use temperate rainforest, rocky coastlines, and dense vegetation. There is little shared nesting or haul-out habitat between them. Habitat here is architecture, not scenery: shelter, predators, and access to prey decide who can breed successfully.
Separate ranges
Emperor Penguins live in Antarctica; Fiordland Penguins live in New Zealand (South Island) and Stewart Island. Non-overlapping ranges usually mean different currents, predator guilds, and fisheries pressure — which is why conservation headlines for one rarely transfer cleanly to the other.
What they hunt
Emperor Penguins eat fish, squid, and krill; Fiordland Penguins eat squid, crustaceans, and small fish. Distinct items on each list (fish and krill versus crustaceans and small fish) hint at different dive depths and foraging schedules. Both still lean on squid, so ocean productivity swings can hit them together.
Dive depth
The Emperor Penguin reaches 565 m — 9 times the Fiordland Penguin's 60 m. Depth buys access to prey that shallower divers never reach, and it is paid for in oxygen storage, muscle chemistry, and the time each foraging trip takes.
Clutch size
The Emperor Penguin lays 1 egg per season; the Fiordland Penguin lays 2. A single-egg strategy concentrates everything into one chick and leaves no margin if it fails, which is why single-egg species tend to invest far longer in incubation — here 64–67 days against 30–36.
Abundance
There are roughly 95 times as many Emperor Penguins as Fiordland Penguins — ~595,000 individuals against ~6,250 mature individuals. Rarity is not the same as risk, but it sets how little has to go wrong before a decline becomes irreversible.
Conservation pressure
The Emperor Penguin carries the sharper label (Endangered, population ~595,000 individuals) against the Fiordland Penguin's Vulnerable (~6,250 mature individuals). Uplisted from Near Threatened to Endangered on the IUCN Red List in April 2026, in an assessment coordinated by BirdLife International. The lower-risk bird is not “safe”; it simply has a wider margin before the same kinds of ocean or land failure become terminal.
Key Similarities
Same family, different genera
Both are penguins in Spheniscidae, yet they sit in different genera (Aptenodytes vs Eudyptes). That distance usually shows up as different colony style, crest or band patterns, and how hard each bird depends on a single prey or ice type.
Overlapping prey
They both take squid. Shared prey is a coupling: a krill or forage-fish crash can stress both populations even when colonies sit far apart.
Why both still feel like penguins
Most birds solve incubation by sitting on a nest. This is a crested penguin that treats dense rainforest, caves, and boulder tangles as normal nesting habitat, which still feels wrong until you see where it lives. Underneath those quirks sit the same flightless, flipper-driven design that makes every living penguin a swimming specialist rather than an aerial one.
How to read this matchup
Read this pair as distant solutions to “how to be a penguin.” Size, genus, and risk already point different ways: Emperor Penguin versus Fiordland Penguin, Aptenodytes versus Eudyptes, Endangered versus Vulnerable. Use the profiles for depth — this page is the decision tree for which difference matters first.
About Each Species
Emperor Penguin
The Emperor Penguin is not built to defeat Antarctic winter. It survives by turning a breeding pair into a relay team, with the male becoming a walking incubator on sea ice.
The largest penguin species, Emperor Penguins are the only animal to breed during the Antarctic winter, trekking up to 120 km over sea ice to reach their colonies and enduring temperatures below −40 °C.
Full Emperor Penguin profileFiordland Penguin
Fiordland Penguins look like crested rock specialists until they vanish into wet forest. Tawaki survive by being hard to reach and harder to read.
Also known as Tawaki, this elusive yellow-crested penguin nests in dense temperate rainforests along New Zealand's Fiordland coast — one of the few penguins to breed in forest environments.
Full Fiordland Penguin profileFrequently Asked Questions
Which is bigger, the Emperor Penguin or the Fiordland Penguin?
The Emperor Penguin is larger — up to 130 cm and 45 kg — while the Fiordland Penguin reaches about 71 cm and 5.9 kg.
Which is more endangered, the Emperor Penguin or the Fiordland Penguin?
The Emperor Penguin sits higher on the IUCN ladder (Endangered, ~595,000 individuals) than the Fiordland Penguin (Vulnerable, ~6,250 mature individuals). Uplisted from Near Threatened to Endangered on the IUCN Red List in April 2026, in an assessment coordinated by BirdLife International.
Do Emperor Penguins and Fiordland Penguins live in the same place?
No meaningful range overlap. Emperor Penguins: Antarctica. Fiordland Penguins: New Zealand (South Island) and Stewart Island.
What do Emperor Penguins and Fiordland Penguins eat?
Both take squid. Full lists: fish, squid, and krill for the Emperor Penguin; squid, crustaceans, and small fish for the Fiordland Penguin.
What is the biggest survival difference between Emperor Penguins and Fiordland Penguins?
Emperor Penguin: Everything about an emperor colony depends on stable sea ice lasting long enough for one chick to hatch, survive the coldest weeks of the year, and meet open water again before the platform breaks apart. Fiordland Penguin: They must move between rough surf and concealed forest nests while staying hidden from predators and human disturbance in a very narrow breeding window.
Are Emperor Penguins and Fiordland Penguins closely related?
They are both penguins (Spheniscidae) but sit in different genera: Aptenodytes (Emperor Penguin) and Eudyptes (Fiordland Penguin). That is family-level relatedness, not a close sister-species pair.