Table 1

Net number of species qualifying for revised IUCN Red List categories between assessments owing to genuine improvement or deterioration in status, for birds (1988 to 2008), mammals (1996 to 2008), and amphibians (1980 to 2004). Category abbreviations are as for Fig. 1; CR(PE/PEW) denotes Critically Endangered (Possibly Extinct or Possibly Extinct in the Wild). CR excludes PE/PEW. Species undergoing an improvement (i.e., moving from a higher to a lower category of threat) are indicated by “+”; species deteriorating in status (i.e., moving from a lower to a higher category of threat) are indicated by “–”. Species changing categories for nongenuine reasons, such as improved knowledge or revised taxonomy, are excluded. In the case of birds, for which multiple assessments have been undertaken, values in parentheses correspond to the sum of all changes between consecutive assessments; the same species may therefore contribute to the table more than once [see (16)].

Red List category at end of period
EXEWCR
(PE/PEW)
CRENVUNTLC
Red List category at start of periodBirdsEX0000000
EW00+1 (+1)0000
CR (PE/PEW)0000000
CR–2 (–2)–2 (–2)–7 (–7)+16 (+19)+1 (+3)00
EN000–22 (–27)+4 (+5)00
VU000–10 (–11)–34 (–41)+9 (+10)0 (+1)
NT000–4 (–4)–5 (–2)–40 (–47)+1 (+1)
LC000–1 (0)–5 (–4)–5 (–5)–78 (–81)
MammalsEX0000000
EW00+1+1000
CR (PE/PEW)0000000
CR0–1–3+3+200
EN000–31+3+10
VU000–2–39+5+1
NT000–1–4–47+7
LC0000–2–2–39
AmphibiansEX0000000
EW0000000
CR (PE/PEW)–2000000
CR–3–1–340+200
EN–20–42–770+20
VU–20–19–51–4500
NT000–7–18–320
LC000–3–8–20–92