By Natalia Rueda 
Mexico is currently facing an unprecedented climate crisis, with extreme temperatures reaching over 45 °C in the southern states of Tabasco and Chiapas. This situation is not only affecting the human population, but is also having devastating consequences for the local fauna, especially howler monkeys, a species that is already in danger of extinction.
Since May 5, more than 80 howler monkeys, which usually inhabit the treetops, have been seen falling from heights due to weakening caused by dehydration and excessive heat, underscoring the seriousness of the situation.
What is a heat wave?
A heat wave is a prolonged period of excessively high temperatures, usually accompanied by conditions of high humidity. These heat waves are climatic phenomena that can last from several days to weeks and have detrimental effects on both human health and the environment. According to scientists, Mexico is experiencing its third heat wave so far this year, an alarming frequency that points to significant and persistent climate changes.
The Impact on Howler Monkeys
Howler monkeys, iconic inhabitants of tropical rainforests, are a keystone species for the ecosystem and are in alarming danger of extinction. These primates not only play a crucial role in seed dispersal that favors forest regeneration, but also contribute to the ecological balance of their habitat.
However, extreme temperatures are taking a devastating toll. Water sources are drying up, and vegetation is unable to provide the necessary hydration. Howler monkeys, which depend on these resources for survival, are dying of dehydration.
Other anthropogenic factors, such as drought, forest fires and uncontrolled logging, are threatening their survival, compromising not only their well-being but also the ecological balance of essential regions of the country.
Toxic Agrochemicals: Another Risk Factor
In addition to extreme heat, toxic agrochemicals pose another serious threat to howler monkeys. In their desperate search for food and water, these animals are exposed to pesticide residues and other chemicals used in agriculture. These pollutants not only affect the monkeys’ health in the short term, causing illness and weakness, but also have long-lasting effects that can lead to death.
An Ongoing Climate Crisis
The increase in the frequency and intensity of heat waves in Mexico is a clear indication of the climate crisis facing the planet. Climate change, driven by human activity, is altering natural weather patterns and exacerbating extreme events such as heat waves.
Civil organizations such as Conservación de la Biodiversidad del Usumacinta have taken urgent measures to mitigate the impact of extreme temperatures on local wildlife. Initiatives include the distribution of water and food to prevent animals from having to travel long distances under the scorching sun.
For howler monkeys and many other endangered species, this situation is particularly devastating. Human actions, such as drought, forest fires and logging that deprive them of water, shade and the fruit they eat, are threatening the biodiversity and ecological balance of key regions of the country.