Eastern Rockhopper Penguin vs Snares Penguin
Eastern Rockhopper Penguins and Snares Penguins are both Eudyptes — same evolutionary sketchbook, different finished drawings in size (55 cm vs 61 cm) and range. Eastern Rockhopper Penguin: Eastern Rockhoppers survive on remoteness and athleticism, but neither trait protects them from large ocean changes. Snares Penguin: The Snares Penguin is what happens when an entire species bets on one remote island group staying dependable for a very long time. The table below is the evidence; the prose is what the evidence means.
Eastern Rockhopper Penguin
Snares Penguin
Size Comparison
Eastern Rockhopper Penguin
45-55 cm
2.1-3.5 kg
Snares Penguin
51-61 cm
2.5-4 kg
| Feature | Eastern Rockhopper Penguin | Snares Penguin |
|---|---|---|
| Conservation | Vulnerable | Vulnerable |
| Scientific Name | Eudyptes filholi | Eudyptes robustus |
| Height | 45-55 cm | 51-61 cm |
| Weight | 2.1-3.5 kg | 2.5-4 kg |
| Lifespan | 10-30 years | 15-20 years |
| Population | ~1.6 million breeding pairs | ~25,000 breeding pairs |
| Diet | Krill, Squid, Fish, Crustaceans | Krill, Squid, Small fish |
| Habitat | Rocky coastlines, Cliff faces, Tussock grass | Sub-Antarctic islands, Rocky shores, Olearia forest |
| Regions | Campbell Island, Antipodes Islands, Crozet Islands, Kerguelen Islands, Heard Island, Macquarie Island | Snares Islands (New Zealand) |
| Genus | Eudyptes | Eudyptes |
Conservation Status
Eastern Rockhopper Penguin
VulnerableSnares Penguin
VulnerableScientific Name
Eastern Rockhopper Penguin
Eudyptes filholi
Snares Penguin
Eudyptes robustus
Height
Eastern Rockhopper Penguin
45-55 cm
Snares Penguin
51-61 cm
Weight
Eastern Rockhopper Penguin
2.1-3.5 kg
Snares Penguin
2.5-4 kg
Lifespan
Eastern Rockhopper Penguin
10-30 years
Snares Penguin
15-20 years
Population
Eastern Rockhopper Penguin
~1.6 million breeding pairs
Snares Penguin
~25,000 breeding pairs
Diet
Eastern Rockhopper Penguin
Krill, Squid, Fish, Crustaceans
Snares Penguin
Krill, Squid, Small fish
Habitat
Eastern Rockhopper Penguin
Rocky coastlines, Cliff faces, Tussock grass
Snares Penguin
Sub-Antarctic islands, Rocky shores, Olearia forest
Regions
Eastern Rockhopper Penguin
Campbell Island, Antipodes Islands, Crozet Islands, Kerguelen Islands, Heard Island, Macquarie Island
Snares Penguin
Snares Islands (New Zealand)
Genus
Eastern Rockhopper Penguin
Eudyptes
Snares Penguin
Eudyptes
Key Differences
Not a second table — the reasons the numbers diverge.
Survival problem
Eastern Rockhopper Penguin: Their breeding system depends on steep island colonies remaining paired with nearby productive seas, a combination that is harder to trust when prey fields shift. Snares Penguin: Its breeding range is tiny, so any sustained change in nearby food supply, disease, or island conditions matters at species scale almost immediately. 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 Snares Penguin is only slightly taller on average — up to 61 cm and 4 kg against the Eastern Rockhopper Penguin's 55 cm and 3.5 kg. That gap changes dive physics, fasting capacity, and how each bird spends energy on land and at sea.
Habitat logic
Eastern Rockhopper Penguins use rocky coastlines, cliff faces, and tussock grass; Snares Penguins use sub-antarctic islands, rocky shores, and olearia forest. 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
Eastern Rockhopper Penguins live in Campbell Island, Antipodes Islands, Crozet Islands, Kerguelen Islands, Heard Island, and Macquarie Island; Snares Penguins live in Snares Islands (New Zealand). 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
Eastern Rockhopper Penguins eat krill, squid, fish, and crustaceans; Snares Penguins eat krill, squid, and small fish. Distinct items on each list (fish and crustaceans versus small fish) hint at different dive depths and foraging schedules. Both still lean on krill and squid, so ocean productivity swings can hit them together.
Both work the same part of the water column
Recorded maximum dives are close — 113 m for the Eastern Rockhopper Penguin against 120 m for the Snares Penguin. When two penguins hunt at the same depth they are usually competing for the same prey layer, which makes where they breed matter more than how they hunt.
Abundance
There are roughly 64 times as many Eastern Rockhopper Penguins as Snares Penguins — ~1.6 million breeding pairs against ~25,000 breeding pairs. Rarity is not the same as risk, but it sets how little has to go wrong before a decline becomes irreversible.
Shared risk band
Both sit at IUCN Vulnerable. Estimated numbers still differ — ~1.6 million breeding pairs for the Eastern Rockhopper Penguin versus ~25,000 breeding pairs for the Snares Penguin. Even under the same IUCN label, trends differ: Eastern Rockhopper Penguins are tracked as decreasing, while Snares Penguins are stable. A shared status means comparable risk class, not identical causes.
Lifespan window
Eastern Rockhopper Penguins are built for a longer adult career (10–30 years) than Snares Penguins (15–20 years). Longer lives amplify the cost of a bad breeding decade; shorter lives put more pressure on every successful chick year.
Key Similarities
Shared genus: Eudyptes
Both belong to Eudyptes, so they inherit a related body plan and many of the same physiological constraints. Related does not mean interchangeable — size, range, and breeding rules still split them — but it explains why field marks and moult timing can look related even when habitats diverge.
Overlapping prey
They both take krill and squid. Shared prey is a coupling: a krill or forage-fish crash can stress both populations even when colonies sit far apart.
Both Vulnerable
IUCN places both at Vulnerable. Treat that as a risk band, not a single storyline: the Eastern Rockhopper Penguin and Snares Penguin can share a label while failing for different local reasons.
How to read this matchup
Read this pair as one lineage under two constraints. The Snares Penguin shows the bigger expression of the Eudyptes plan; the Eastern Rockhopper Penguin shows how far that plan can shrink or specialise. When risk differs, follow the Eastern Rockhopper Penguin for pressure and the Snares Penguin for what a related bird still manages with more margin.
About Each Species
Eastern Rockhopper Penguin
Eastern Rockhoppers survive on remoteness and athleticism, but neither trait protects them from large ocean changes.
Recognized as a distinct species from the Western Rockhopper since 2006, Eastern Rockhoppers breed on sub-Antarctic islands in the Indian and Pacific Oceans and share the same bold yellow crest and red eyes as their relatives.
Full Eastern Rockhopper Penguin profileSnares Penguin
The Snares Penguin is what happens when an entire species bets on one remote island group staying dependable for a very long time.
Endemic to the tiny Snares Islands south of New Zealand, this yellow-crested penguin has the most restricted range of any penguin species, yet maintains a healthy population thanks to the absence of introduced predators.
Full Snares Penguin profileFrequently Asked Questions
Which is bigger, the Eastern Rockhopper Penguin or the Snares Penguin?
The Snares Penguin is larger — up to 61 cm and 4 kg — while the Eastern Rockhopper Penguin reaches about 55 cm and 3.5 kg.
Are Eastern Rockhopper Penguins or Snares Penguins more endangered?
Both are listed as Vulnerable. Numbers still differ: ~1.6 million breeding pairs for the Eastern Rockhopper Penguin versus ~25,000 breeding pairs for the Snares Penguin. Trends: decreasing vs stable.
Do Eastern Rockhopper Penguins and Snares Penguins live in the same place?
No meaningful range overlap. Eastern Rockhopper Penguins: Campbell Island, Antipodes Islands, Crozet Islands, Kerguelen Islands, Heard Island, and Macquarie Island. Snares Penguins: Snares Islands (New Zealand).
What do Eastern Rockhopper Penguins and Snares Penguins eat?
Both take krill and squid. Full lists: krill, squid, fish, and crustaceans for the Eastern Rockhopper Penguin; krill, squid, and small fish for the Snares Penguin.
What is the biggest survival difference between Eastern Rockhopper Penguins and Snares Penguins?
Eastern Rockhopper Penguin: Their breeding system depends on steep island colonies remaining paired with nearby productive seas, a combination that is harder to trust when prey fields shift. Snares Penguin: Its breeding range is tiny, so any sustained change in nearby food supply, disease, or island conditions matters at species scale almost immediately.
Are Eastern Rockhopper Penguins and Snares Penguins closely related?
Yes — both are genus Eudyptes within Spheniscidae, so they share a relatively recent common ancestor and related anatomy, even when range and size diverge.
Which lives longer, the Eastern Rockhopper Penguin or the Snares Penguin?
The Eastern Rockhopper Penguin generally has the longer window (10–30 years) versus 15–20 years for the Snares Penguin.