Cuéllar graduated in biology from the
Gabriel René Moreno Autonomous University and then obtained a master's degree in
Biodiversity Conservation from the
University of Kent in England. She earned a PhD in
Zoology at the
University of Oxford. , the wild ancestor of the
llama. Cuéllar's work focuses mainly on the conservation and sustainable protection of the Gran Chaco, she is coordinator of the Species Survival Committee of the
International Union for Conservation of Nature. A fundamental part of her work consists of training parabiologists, that is, making communities and the local population participate in caring for their environment through comprehensive training so that they can be researchers and custodians of natural resources. In this regard, she has said: “I would like the local people, who know so much about nature, because they were born and lived in it, to stop being (considered) simply cheap labor.” (Sekeetamys calurus), adult male She has worked prominently for the protection of juvenile and adult
guanacos. Thanks to Cuéllar's efforts, their hunting has become prohibited, the repopulation of genetically isolated herds is being explored and attempts are being made to recover their habitat, which had been invaded by free-range cattle and invasive plants.In 2016, Cuéllar was part of the team that made the first recorded sightings of the
Sekeetamys calurus rodent (Bushy-tailed Jird) in the territory of southern
Oman, in western Asia. == Selected awards ==