Cozumel Harvest Mouse (Reithrodontomys spectabilis) is assessed as Critically Endangered because this species is known only from Cozumel Island, Mexico where it is estimated to exist in small subpopulations (< 50 individuals/subpopulation) with an estimate of less than 200 individuals in the entire population. The species has not recovered from negative impacts from introduced species…
Phylum: Chordata
Roatán Spiny-tailed Iguana
Roatán Spiny-tailed Iguana (Ctenosaura oedirhina) has an extent of occurrence of 294 km2 measured by minimum convex polygon. Its area of occupancy is 191 km2 using a 1×1 km grid overlay, although the actual occupied area of stable populations is likely closer to 6 km2. The population is severely fragmented across Roatán, with the majority…
Galapagos Penguin
Long-term monitoring of the Galapagos Penguin (Spheniscus mendiculus) indicates that the population is fluctuating, primarily as a result of marine perturbations that may be becoming more extreme through climate change. These perturbations have caused an overall very rapid population reduction over the last three generations (31 years). In addition, the species has a small population…
Jico Deer Mouse
Jico Deer Mouse (Habromys simulatus) is listed as Critically Endangered because it is known from only two subpopulations: one is likely now extinct, and the other has extremely low population numbers (less than or equal to 50). Most of the mature individuals from are in one subpopulation. If more habitat continues to disappear, this species…
Ridgway’s Hawk
Ridgway’s Hawk (Buteo ridgwayi) is listed as Critically Endangered because it has a small and fragmented population, which was previously in steep decline. Successful conservation action has now reversed such declines and the species is observed to be increasing throughout both its largest extant population in Los Haitises National Park and additional reintroduced populations. If…
Pied Tamarin
Pied Tamarin (Saguinus bicolor) is considered Critically Endangered due to a projected population reduction of 80% or more in the next 18 years (three generations) due to serious multiple threats suffered within a very concentrated range in and around the city of Manaus: deforestation and habitat fragmentation related to expanding rural settlements and agriculture, livestock…
Cuban Crocodile
Cuban Crocodile (Crocodylus rhombifer) is endemic to Cuba. The species is assessed as Critically Endangered (CR A2cde), keeping the same status as in the previous assessment (2008). Population decline is still estimated at >80% over the last three generations (approximately 75 years). This reduction in population size is based on the decline in habitat extent…
Anegada Rock Iguana
Although it is believed the Anegada Rock Iguana (Cyclura pinguis) population size has increased somewhat since the headstarting programme began releasing subadults, the habitat is continuing to be degraded. The significant population reduction (> 80%) for this species occurred over a much longer time period than three generations (66 years) ago due to the introduction…
Mojave Desert Tortoise
Mojave Desert Tortoise (Gopherus agassizii) was assessed as Critically Endangered A2bce+A4bce based on population reduction (decreasing density), habitat loss of over 80% over three generations (90 years), including past reductions and predicted future declines, as well as the effects of disease (upper respiratory tract disease / mycoplasmosis). Available at: https://www.iucnredlist.org/species/97246272/3150871
Mangrove Finch
Mangrove Finch (Geospiza heliobates) has an extremely small, severely fragmented range, and only two viable subpopulations. Recent surveys suggest that the number of locations and mature individuals are both declining significantly, and consequently it qualifies as Critically Endangered. Available at: https://www.iucnredlist.org/species/22723786/182523098