3.2.6—Species case studies

A conservation case is complete only when it links the cause of decline, ecological or social impact, intervention and evidence of the outcome. Compare different status pathways rather than treating every threatened species as the same problem.

Named species	Status pathway and causes	Impact, action and evidence
Thylacine or Tasmanian tiger	Extinct after intensive hunting, bounties and later pressure from disease and competition with settlers’ dogs	Loss removed a native predator; protection came too late, after the last wild and captive animals had died
Mindo harlequin toad	Critically endangered after chytrid disease, habitat degradation, pesticide pollution and predation by introduced trout	Rediscovery of a very small surviving population allows conservation, but persistent disease, habitat and genetic constraints make recovery difficult
Australian saltwater crocodile	Recovered sufficiently to be removed from endangered status after overhunting had reduced populations	Legal protection, CITES trade controls and managed ranching reduced pressure on wild populations; recovery evidence is the improved conservation status and thriving populations

For each case, keep action separate from success: a law is an intervention, while a measured population or status change is outcome evidence. Also trace consequences through food webs, ecosystem services, livelihoods or culture where the local evidence supports them.

Use the same chain for all three cases: pressure → decline → ecological or social consequence → conservation response → measured outcome.

Conservation effort is not automatically conservation success; status and population evidence must show whether risk actually changed.