Photos: Cuban scientists race to save one of the world´s rarest crocodiles

Cuba's palm-speckled Zapata Swamp, researcher Etiam Perez releases a baby crocodile confiscated from illegal hunters back into the wild.

It is a small victory, he says, in a bigger battle. Cuban crocs, an endemic species found only here and in a swamp on Cuba's Isle of Youth, are critically endangered and have the smallest natural habitat left of any living crocodile species, scientists say.

"We are trying to bring them back from the edge of extinction," Perez told Reuters as the spotted reptile, mouth full of fine teeth, kicked its striped tail and disappeared. Above, Cuban crocodiles (Crocodylus rhombifer) are carried inside a box by biologists prior to being released into nature at Zapata Swamp, Cienaga de Zapata, Cuba.

A newly-hatched Cuban crocodile (Crocodylus rhombifer) emerges from an egg at a hatchery at Zapata Swamp, Cienaga de Zapata, Cuba. Illegal hunting and hybridization with American crocodiles - which muddles the species' genetics - have for decades threatened populations here. A warming climate, which alters the sex ratio of newborn crocs, poses a new threat.

And despite the fact that the Cuban government has protected virtually all of the vast swamp - widely considered to be the best preserved in the Caribbean - that may still not be enough, scientists say. Above, veterinarian Gustavo Sosa shows newly-hatched Cuban crocodiles (Crocodylus rhombifer) to tourists at a hatchery at Zapata Swamp, Cienaga de Zapata, Cuba.

"When you compare the Cuban crocodile with other species in the world, its house is very small," said Gustavo Sosa.

Cuban scientists estimate that around 4,000 Cuban crocodiles live in the wild. But because the area they prefer within the wetland is relatively small, a climate-related disaster - increasingly common now globally - could wipe out most of the population.

Those concerns decades ago prompted the Cuban government to underwrite a hatchery program that annually releases several hundred crocodiles into the wild.

Biologist Etiam Perez, 43, watches a newly released Cuban crocodile (Crocodylus rhombifer) swimming at the Zapata Swamp. Researchers like Perez also liberate crocodiles confiscated from hunters as part of a program that has helped reduce poaching of the species.

The International Union for the Conservation of Nature, which listed the species as critically endangered in 2008, says its assessment and population estimates need updating, but confirms long-standing concerns over the limited habitat of the species.

"With the hatchery we are trying to increase the historical range of the Cuban crocodile and of course increase the number of these individuals in the wild," Perez said.

Tourists watch Cuban crocodiles (Crocodylus rhombifer) in their cage at a hatchery at Zapata Swamp, Cienaga de Zapata, Cuba. The sale of crocodile meat in Cuba is tightly controlled by the state, and only those crocodiles with physical defects or hybrid genetics, for example, are allowed in restaurants. An illegal market, however, can still be found in some areas, particularly around the swamp.

Fuel shortages, antiquated equipment and often inhospitable conditions are constant challenges in Cuba, a Caribbean island nation gripped by a dire economic crisis. But at Zapata, those concerns feel distant as this year´s crop of freshly hatched crocs, still covered in mucus from their eggs, snap their jaws at pieces of fresh river fish, moving in unison as they discover their new world.