Types of Manatee in Florida

The West Indian manatee is the only manatee species found in Florida. This species occurs naturally throughout the Caribbean, Central America, and Florida. The Florida subspecies (Trichechus manatus latirostris) is the population that lives in Florida's coastal and freshwater habitats. West Indian manatees are large, slow-moving marine mammals that can weigh between 800 and 1,200 pounds and grow up to 10 feet long. They are herbivores that feed on seagrass, algae, and aquatic vegetation, spending much of their time in shallow waters where food is abundant. Florida's population was protected under the Endangered Species Act in 1967 and has made significant recovery since then.

West Indian manatees are relatively easy to identify if you know what features to look for. They have large, gray bodies that are wrinkled and covered with algae and barnacles in the wild. Their front flippers have five digits that resemble fingers, which they use to manipulate food and move through the water. The most distinctive feature is their large, flexible upper lip, which they use to grasp aquatic vegetation and has a pattern of sensitive hair follicles used to detect food. Manatees have small eyes relative to their body size and no external ear lobes. Their tail is large and paddle-shaped, unlike the fluked tail of dolphins. An adult manatee moves slowly and deliberately through the water, often basking near the surface.

Manatees are herbivorous mammals that spend up to seven hours per day feeding. They eat a variety of aquatic plants, including seagrass, algae, water hyacinth, and mangrove leaves. In different seasons and locations, they may prefer different vegetation. In coastal areas, they feed on seagrass such as turtle grass and manatee grass, while in freshwater systems like rivers and springs, they may eat more algae and freshwater plants. A single manatee can consume between 40 and 120 pounds of vegetation per day, depending on the season and availability of food. Their grazing activities help maintain aquatic plant communities and influence water quality in the ecosystems where they live.

Adult West Indian manatees typically weigh between 800 and 1,200 pounds, though some individuals can exceed 1,500 pounds. Their length usually ranges from 8 to 10 feet, with some exceptional individuals reaching up to 12 feet long. Females tend to be slightly larger than males on average. Calves are born at around 60 pounds and grow rapidly during their first year. Growth continues into adulthood, and manatees can live for 40 years or more in the wild, making them long-lived marine mammals. Their large body size is an adaptation to their aquatic lifestyle and helps them maintain body temperature in warm Florida waters.

Individual manatees can often be identified by their unique scars and marks. Many manatees bear propeller scars from boat strikes, which are visible as distinct linear marks across their bodies. Other marks include barnacle colonization patterns, algae growth patterns, and scars from injuries sustained during their lives. These identifying marks are so distinctive that researchers use photo identification to track individual animals over time. Some manatees develop extensive scar tissue that gives them a wrinkled appearance. These scars are not just identifying features; they are a testament to the threats manatees face, particularly from boat traffic in shallow waters.

Adult manatees have no significant natural predators in Florida due to their large size and the absence of large marine predators in state waters. Historical records mention that jaguars may have preyed on manatees in the Caribbean and Central America, but no such predators exist in Florida. Young calves may occasionally be vulnerable to sharks in coastal areas, but mortality from predation is minimal. The primary threat to manatees today is human-related, particularly collisions with boats and loss of habitat. Manatees gather in warm-water springs and power plant discharge areas during winter, where they are more vulnerable to boat traffic.

Manatees produce a variety of vocalizations, including squeaks, whistles, and chirps. They use these sounds to communicate with other manatees, particularly mothers with their calves. Calves make high-pitched squeaking sounds to stay in contact with their mothers, and mothers respond with lower-frequency vocalizations. Manatees also communicate through tactile interactions, such as touching with their sensitive flippers. They are generally solitary or found in small groups, but they can gather in larger aggregations at warm-water refuges. The function of many manatee vocalizations remains poorly understood, though scientists believe they play an important role in maintaining family bonds and social interactions.

Female West Indian manatees reach sexual maturity at around three to five years of age. Mating can occur year-round, but births are more common in spring and early summer. The gestation period is approximately 13 months, so most calves are born between March and August. A single calf is the typical outcome, though twins occasionally occur. The calf nurses for up to two years, during which the mother is highly protective and teaches the young manatee where to find food and warm-water refuges. Mother-calf pairs often remain together for several years, with the young manatee learning critical survival skills from its mother.

West Indian manatees are highly adaptable to both freshwater and saltwater environments, but their movement patterns vary by individual and by season. Some manatees remain in coastal saltwater areas year-round, while others migrate between freshwater rivers and springs and coastal waters depending on food availability and temperature. In winter, many manatees move into warm-water springs and power plant discharge areas to avoid cold water, which can stress or kill them. Summer months see more dispersal into coastal areas and rivers as temperatures warm. Manatees that inhabit river systems may migrate several hundred miles between feeding areas and warm-water refuges. Their flexibility in moving between different water types is one of their most important survival adaptations.