Every year, billions of animals undertake extraordinary journeys to survive. Migratory species such as whales crossing oceans, birds traversing continents, and butterflies traveling thousands of kilometers in search of food, reproduction, and more favorable climates.
These movements are part of ecological processes that have existed for millions of years. Thanks to them, numerous ecosystems maintain their natural balance and support complex food chains.
However, this natural phenomenon currently faces a critical situation. International reports warn that nearly 49% of migratory species protected by global agreements are in population decline.
Moreover, around 24% of these species face some level of extinction risk. This trend is causing concern among scientists and environmental organizations worldwide. In light of this scenario, the international community is analyzing protection measures during global meetings, including a summit on migratory species to be held in Brazil.
The deterioration of migratory populations in recent decades
The latest data shows that the situation of these animals has worsened in recent years. In just two years, at least 26 migratory species have been reclassified into higher risk categories of extinction.
Among them are mainly birds, as 18 species of this group have moved to higher threat levels. This reflects a progressive deterioration of the migratory routes they use each season.
The most alarming case concerns migratory fish. Since the 1970s, their populations have decreased by an average of 90%, representing one of the most pronounced collapses recorded in wildlife.
Furthermore, it is estimated that up to 97% of protected migratory fish species currently face some risk of extinction. Among the most concerning examples are eels and their young known as elvers.
On the other hand, climate change is also beginning to alter iconic migrations, such as that of the monarch butterflies, whose journey depends on very specific environmental conditions.
The causes that put migratory species at risk
One of the main factors affecting these animals is habitat loss. Agricultural expansion, urbanization, and intensive land exploitation reduce the natural spaces necessary for their survival.
Additionally, landscape fragmentation disrupts the migratory corridors that species have used for generations. When these natural pathways disappear, the animals encounter increasingly more obstacles to complete their journeys.
Human infrastructures also pose a growing threat. Dams, roads, and large projects alter the rivers, forests, and coastal areas that many species need to move.
Added to this is the overexploitation of natural resources, which includes intensive fishing and hunting in some regions. These pressures reduce populations that are already weakened. Together, these factors create an increasingly complex scenario for animals whose survival depends on traveling long distances between different ecosystems.
Conservation initiatives and signs of hope
Despite the worrying outlook, some conservation efforts have begun to show positive results. Programs coordinated between countries have improved the conservation status of several migratory species.
Among the most encouraging cases are the saiga antelope, the white oryx, and the Mediterranean monk seal, which have managed to recover part of their populations thanks to protection and monitoring policies.
Furthermore, new scientific technologies are allowing for more precise mapping of the migratory routes of numerous species. This knowledge helps identify ecological corridors and critical habitats that need to be protected.
Specialists agree that strengthening environmental legislation, improving surveillance, and promoting international cooperation will be key to ensuring the survival of these travelers of the planet. Otherwise, they warn, many of the migratory movements that amaze the world today could disappear along with the species that perform them.
