British Indian Ocean Territory vs Tanzania: Red List Index
British Indian Ocean Territory
0.8 index
in 2025
Tanzania
0.8 index
in 2025
British Indian Ocean Territory rank
167th
Tanzania rank
167th
Red List Index over time
- British Indian Ocean Territory
- Tanzania
How they compare
British Indian Ocean Territory currently reports 0.8 index against 0.8 index in Tanzania, a difference of 0 index.
The two have swapped places 3 times across 46 shared years of data; in 1980 it was British Indian Ocean Territory ahead.
British Indian Ocean Territory ranks 167th and Tanzania ranks 167th of 247 countries.
British Indian Ocean Territory has averaged higher in every one of the 5 decades both report.
Head to head by decade
| Decade | British Indian Ocean Territory | Tanzania | Difference | Ahead |
|---|---|---|---|---|
| 1980s | 0.91 index | 0.85 index | 0.06 index | British Indian Ocean Territory |
| 1990s | 0.907 index | 0.85 index | 0.057 index | British Indian Ocean Territory |
| 2000s | 0.878 index | 0.84 index | 0.038 index | British Indian Ocean Territory |
| 2010s | 0.842 index | 0.826 index | 0.016 index | British Indian Ocean Territory |
| 2020s | 0.8117 index | 0.8067 index | 0.005 index | British Indian Ocean Territory |
Averages of every year both report within each decade.
Frequently asked questions
- Which has higher red list index, British Indian Ocean Territory or Tanzania?
- British Indian Ocean Territory, at 0.8 index against 0.8 index in Tanzania as of 2025.
- What is the difference in red list index between British Indian Ocean Territory and Tanzania?
- 0 index, with British Indian Ocean Territory ahead.
- How many years of comparable data are there for British Indian Ocean Territory and Tanzania?
- 46 years are reported by both, from 1980 to 2025.
- How do British Indian Ocean Territory and Tanzania rank globally for red list index?
- British Indian Ocean Territory ranks 167th and Tanzania ranks 167th of 247 countries.
- Where does this data come from?
- BirdLife International and IUCN β processed by Our World in Data, published as Red List Index. Statizoid refreshes it automatically from the source and publishes the full history for both places.
Individual pages
About this data
Red List Index.