Baird's Tapir

The **Baird's tapir** (*Tapirus bairdii*), also known as the **Central American tapir**, is a species of tapir native to Mexico, Central America and northwestern South America. It is one of four Latin American species of tapir.

## Range and Habitat

Historically, Baird’s tapirs ranged from southeastern Mexico through northern Colombia to the Gulf of Guayaquil in Ecuador. Today they are found in isolated populations in the same range. They are considered extinct in El Salvador. Baird’s tapirs are found in most vegetation types at elevations ranging from sea level to 3,600 meters. They are found in marsh and swamp areas, mangroves, wet tropical rainforests, riparian woodlands, monsoon deciduous forests, montane cloud forests, and paramo (treeless alpine plateau). Food and water availability are important factors in habitat selection. When both primary and secondary forest habitat is available, Baird’s tapirs prefer secondary forest due to the increase in understory plants for foraging and protection.

## Description

Baird’s tapirs are the largest native terrestrial mammals in the Neotropics and the largest of the four living tapir species. About the size of small donkeys, Baird’s tapirs typically weigh between 150 to 300 kilograms. They are dark brown to reddish brown above and paler below with white fringes around their large ears, white lips, and sometimes a white patch on the throat and chest. Their fur is bristly and “piglike.” Baird’s tapirs are well muscled. A long, narrow mane is present but is not always conspicuous. Tapirs have short, slender legs, making them well adapted to rapid movement through underbrush. The snout and upper lips are projected forwards to form a short, fleshy proboscis, which is used for finding food and for detecting tactile stimuli. Their eyes are small and flush with the side of their head while their ears are large, erect, oval, and not very mobile. The forefoot has three main digits and one smaller one while the hind foot has only three digits. Females have a single pair of mammae located in the groin region. Body measurements are as follows: head and body length - 180 to 250 cm, tail length - 5 to 13 cm, shoulder height - 73 to 120 cm.

## Reproduction

Due to the seasonal stability of their habitat, it has been suggested that Tapirus bairdii individuals form long-term monogamous pairs in which the pairs defend a territory. The sex ratio of males to females is 1 to 1. Baird’s tapirs can breed anytime of the year, although breeding may be more common just prior to rainy seasons, as in their close relative T. terrestris. The gestation period is 390 to 400 days. Litter size is one with an average birth mass of 9.4 kg. The average number of litters per year for a T. bairdii female is 0.7. Weaning occurs after one year. Age of sexual maturity is not known for T. bairdii. Malayan tapirs (Tapirus indicus), a Southeast Asian tapir species, mature at three years and Brazilian tapirs (T. terrestris) have been known to conceive as early as 23 months and given birth as old as 28 years. The age structure of T. bairdii populations is approximately 82% adults, 12% juveniles, and 6% young. The proportion of young individuals increases in persistently hunted areas. Offspring remain with their mothers for one to two years. Both parents play a role in raising the young, as the family unit moves and sleeps together. The mother will guide the young by utilizing a nudging motion with her proboscis.

### **Lifespan/Longevity**

Little is known about the longevity of Tapirus bairdii in the wild, but a wild-born animal lived to be 29.6 years in captivity. Furthermore, a captive T. terrestris lived to be 35 years old.

## Behavior

Baird’s tapirs are largely nocturnal but can be active during the day as well. Due to their large body size, Baird’s tapirs have difficulty dissipating heat. Nocturnal behavior is thought to be an adaptation to avoid the hottest times of the day. Baird’s tapirs become more active at night in areas where they are frequently hunted. In areas where there is a dry and wet season, Baird’s tapirs will sleep in freshwater wallowing holes during the dry season and typically sleep within 20 meters of a water source during the wet season. These wallowing holes can be several inches deep and they sleep on their stomach with their head placed on their two front feet. Tapirs do not limit themselves to one sleeping hole but will return to a sleeping area more than once. Baird’s tapirs are excellent runners, sliders, waders, divers, and swimmers and are very agile in or under water and in open or closed habitats. Baird’s tapirs are largely solitary animals and are normally found at low densities. In southern Mexico, the density of T. bairdii was estimated to be 0.24 individuals per square kilometer in areas where there was low hunting pressure and 0.05 tapirs per square kilometer in persistently hunted areas. However, densities can reach up to 0.8 individual per square kilometer in areas with lush vegetation. Although Baird’s tapirs are largely solitary and typically feed alone, social interactions are often observed. Individuals have been observed feeding together on occasion and even exchanging non-threatening physical contact. They have also been observed charging each other, but the charges rarely last for more than a few seconds.

## Communication and Perception

Baird’s tapirs are largely solitary animals and few vocal communications are known. All of observations detailed in this section were recorded at Barro Colorado Island in Panama. The most well-know noise is a continuous whistling sound, typically followed by a similar sound from a nearby tapir. They also make a sound similar to a repeated hiccup, which is though to be related to agitation. Immature tapirs will often emit high-pitched squeaks when frightened or ready to bolt. Mothers that have been separated from their young have been observed emitting loud snore-like breaths until they were reunited with their young. The most important senses to Baird’s tapirs are smell and hearing, both of which are used in finding food and detecting threats. They also locate nearby tapirs by smell. The eyes are small and sight does not seem to be an important mode of perception.

## Food Habits

Baird’s tapirs are strict herbivores, foraging from the forest floor to 1.5 meters above ground. Leaves from a variety of plant species provide the bulk of their diet, but they also eat fruits, twigs, flowers, sedges, and grasses. Fruits from several plant species seem to be preferred when they are in season, but the total amount of fruit eaten varies by habitat. Dietary composition of plant species also varies by season, with some species eaten during certain times of the year but avoided at others. The presence of armor or biting ants on a plant does not deter them from consuming that plant. Baird’s tapirs spend most of their waking hours foraging in a zig-zag pattern. They forage in one of three patterns: 1) feed on several species in a small area, 2) feed only on a single species within a small area, or 3) grab and eat various plants while moving to another area. Tapirs prefer plant species of medium to tall height, but the only plants that are completely avoided are small, widely spaced seedlings and large canopy-level trees. In general, Baird’s tapirs will move to another plant before all of the leaves are consumed on the one it is currently eating. They typically feed in large treefalls or secondary forest because of the high density of understory plants which are generally highly digestible and have few defensive toxins. Occasionally they will rise on their hind feet to reach leaves beyond their normal reach or knock down slender or dead plants to get fruit or leaves. The assimilation of nutrients seems to be poor based on the large overall volume and significant amount of recognizable plant parts in T. bairdii feces.

## Predation

The most significant predator of Tapirus bairdii is humans, but pumas (Puma concolor) and jaguars (Panthera onca) are potential predators of young tapirs. Baird’s tapirs rely largely on camouflage and their large size for protection against predators: at night they blend in extremely well with leafy shrubs, during the day they resemble stationary objects, such as large rocks.