Los Colorados

Los Colorados Flora and Fauna Sanctuary protects one of the last significant remnants of tropical dry forest in the Montes de María region of northern Colombia's Bolívar department. ^[1] Covering approximately 1,000 hectares, this compact sanctuary is named for the red howler monkeys — locally called monos colorados — that inhabit its forest canopy. Despite its small size, Los Colorados harbors important biodiversity representative of the critically threatened Caribbean dry forest ecosystem and holds designation as an Important Bird and Biodiversity Area (AICA).

The sanctuary's namesake red howler monkeys are its most prominent inhabitants, living in troops whose booming calls carry for kilometers. Other primates include white-faced capuchins and critically endangered cotton-top tamarins, both confirmed within the sanctuary. ^[1] The bird community includes over 289 species, with 45 migratory species recorded. Reptiles include iguanas, boas, and the endangered spectacled caiman. Among 44 documented mammal species, agoutis, armadillos, and coatis are commonly observed.

The tropical dry forest features deciduous and semi-deciduous trees that shed their leaves during the dry season. Canopy species include mahogany, ceiba, caracolí, and fig trees reaching 25 to 30 meters. The understory features palms, heliconias, and climbing plants, while cacti and thorny shrubs characterize the forest edges. The forest fragment contains approximately 134 tree species, including regionally rare species extirpated from the surrounding landscape. ^[1]

The sanctuary sits on gently undulating terrain of the Montes de María hill range, consisting of Tertiary sedimentary rocks including limestones, sandstones, and claystones. The limestone substrate creates alkaline soils and occasional karst features. Seasonal streams provide the only surface water, drying completely during the peak dry season months.

Los Colorados experiences a hot tropical climate with pronounced wet and dry seasons. Average temperatures range from 27 to 33 degrees Celsius. The dry season extends from December through March, while the wet season from April through November brings approximately 1,000 to 1,500 millimeters of annual precipitation. The transition between seasons triggers dramatic ecological changes including mass flowering events.

The Montes de María region has been inhabited by indigenous Zenú people and later by Afro-Colombian farming communities. The region experienced waves of forest clearing for cattle ranching and tobacco cultivation. In more recent decades, the area became one of the most affected by Colombia's armed conflict, with displacement of rural communities.

Los Colorados was established as a Flora and Fauna Sanctuary on June 6, 1977, in response to the alarming rate of dry forest destruction throughout the Colombian Caribbean region. ^[1] The small size reflects the limited extent of intact forest remaining at the time. Management has been challenging due to the sanctuary's isolation and limited institutional presence.

A trail system allows visitors to observe wildlife, with howler monkey troops being the most visible and audible attraction during dawn calling sessions. The interpretive trail Planeta Bosque (2,143 meters) winds through the forest. Birdwatching is rewarding during early morning and late afternoon. The dramatic seasonal transformation provides different experiences depending on time of visit. Night walks reveal nocturnal species including owls, kinkajous, and tree frogs.

The sanctuary is located near San Juan Nepomuceno in Bolívar department, accessible by road from Sincelejo or Cartagena, each two to three hours away. Basic accommodations are available in San Juan Nepomuceno. Mandatory guided tours are required with advance reservations recommended at least eight days ahead. The flat terrain makes for easy walking, though heat and humidity can be intense.

The sanctuary's small size and isolation make it highly vulnerable to edge effects. The lack of forest corridors limits wildlife movement and genetic exchange, creating viability concerns for species like cotton-top tamarins. Ongoing work with over 200 families aims to establish more than 1,000 hectares of forest corridors connecting the sanctuary to surrounding private lands. ^[1] Fire from adjacent agricultural burning occasionally enters the sanctuary. Restoration efforts focus on expanding the protected area through forest corridors and buffer zones.