One 5-Star bar from four factors: Animal Husbandry (welfare), Sustainability, Guest Education, and Guest Experience. Welfare is the largest single lever, education is the cheapest multiplier, scenery diversifies the Experience side.

The four factors of the Planet Zoo 2 5-Star Zoo Reputation bar

Animal Husbandry
Welfare check on every species inside the zoo. Includes barrier grade, height, terrain, water depth or flyable area, temperature, cleanliness, and the optional Prospering state per species.
Sustainability
Tracks the player's energy and water networks, the conservation record, and the breeding programme. Recycling and renewable energy sources lift the bar.
Guest Education
Education impact from educators, education speakers, education boards, webcams, guided tours, and donation bins.
Guest Experience
Scenery, theme diversity, food and drink amenities, restroom coverage, queue times, and the optional Prospering state on welfare.

Planet Zoo 2 build order for lifting the 5-Star bar

The build order that lifts the Planet Zoo 2 5-Star bar starts with welfare and finishes with scenery. Welfare first: lay the barrier loop, add per-species terrain, water, and temperature, and place enrichment. A green welfare check is the largest single lever on the bar. Conservation second: complete the conservation record and link it to breeding programmes and Wildlife Reserves. Education third: add educators, education speakers, donation bins, and guided tours. Education is the cheapest multiplier on the bar because the staff and the bins are inexpensive compared to welfare and scenery. Scenery fourth: diversify across zoo themes rather than commit to one; the 9 scenery themes span 5 returning Planet Zoo 1 themes and 4 brand-new Planet Zoo 2 sets, and the Frontier Workshop is a fast source of community scenery builds.

Welfare Prospering state and the rating in Planet Zoo 2

The optional Prospering state is a higher welfare tier that requires research into the species' wild needs. The Prospering state rewards longer lifespans, higher guest donations, and stronger education impact. The research itself counts toward the 39 achievements under the Research milestone. Lifting species into the Prospering state is the single highest-leverage welfare action because it adds welfare, donations, and education impact at the same time. Use the Zoopedia entry for each species to identify the research items, and place the enrichment inside each habitat so the species can use them.