Here are some of the most endangered animals in the world, according to various sources:

1. Vaquita: The vaquita is both the smallest and the most endangered marine mammal in the world. It has been classified as Critically Endangered by the IUCN since 1996, and in 2018, there were only around 6 to 22 vaquitas left.

2. Javan Rhino: The Javan rhino is one of the rarest large mammals in the world, with only around 72 individuals remaining in the wild.

3. Amur Leopard: The Amur leopard is one of the worlds most endangered big cats, with only around 100 individuals remaining in the wild.

4. Sumatran Tiger: The Sumatran tiger is the smallest surviving tiger subspecies and is critically endangered, with only around 400 individuals remaining in the wild.

5. Saola: The saola, a forest-dwelling bovine native to Vietnam and Laos that looks similar to a deer, is critically endangered due to commercial hunting, habitat destruction for commercial agriculture, roads, and mining, and the fact that the saola population is so small that individuals may become separated from one another.

6. Northern Right Whale: Climate change is one of the reasons which affects their food availability and habitat. The population has dropped drastically in the last few years.

7. Black Rhinoceros: Black Rhinoceros is another species that is in the list of endangered species that are going to be extinct forever. In the 20th century, populations of black rhino declined dramatically at the hands of European hunters and settlers. Between 1960 and 1995, black rhino numbers dropped by a sobering 98%, to less than 2,500.

8. Red Wolf: Identifiable by its reddish fur behind their ears, neck and legs, the red wolf is the world’s most endangered wolf with only 15-17 individuals left. Once common in eastern and south central regions of the US, the red wolf was listed as a species “threatened with extinction” under the Endangered Species Preservation Act in 1967, after population numbers have dropped significantly due to decades of human activity including gunshots and vehicle collisions.

9. Hawksbill Turtles: Two species of sea turtle are critically endangered on the IUCN Red List of Threatened Species: Hawksbill Turtles and Kemps Ridley Turtles.

10. Ivory-Billed Woodpecker: The Ivory-Billed Woodpecker is the most critically endangered species out there. It lives in the Southeastern US and parts of Cuba. It is a huge woodpecker that is known for its distinctive call and its striking appearance.

Its important to note that there are many other endangered species in the world, and the list of the most endangered animals can vary depending on the source.