Javan Rhino (Rhinoceros sondaicus): Found in Indonesia, the Javan rhinoceros is one of the rarest large mammals, with only a handful remaining in the wild due to habitat loss and poaching.
Vaquita (Phocoena sinus): The vaquita is a small porpoise found in the northern Gulf of California, Mexico. It is critically endangered, with fewer than 10 individuals believed to exist, primarily due to bycatch in fishing nets.
Northern White Rhino (Ceratotherium simum cottoni): The northern white rhinoceros is functionally extinct in the wild, with only two females remaining.
Spix's Macaw (Cyanopsitta spixii): Native to Brazil, the Spix's macaw is considered extinct in the wild, with the last known individual seen in 2000. Efforts are underway to reintroduce captive-bred birds into their natural habitat.
Sumatran Tiger (Panthera tigris sumatrae): Found only on the Indonesian island of Sumatra, the Sumatran tiger is critically endangered due to habitat loss and poaching. It is estimated that fewer than 400 individuals remain in the wild.
Yangtze Giant Softshell Turtle (Rafetus swinhoei): This freshwater turtle from China's Yangtze River is critically endangered, with possibly fewer than five individuals left.
Hawaiian Monk Seal (Neomonachus schauinslandi): Endemic to the Hawaiian Islands, the Hawaiian monk seal is one of the most endangered marine mammals, with a population of around 1,400 individuals.