So what has caused manatees to become endangered? There are two major threats: loss of habitat and collisions with boats and ships. As new developments are built along waterways, natural nesting areas are destroyed. Sewage, manure, and fertilizer run-off enters the water and causes algal blooms.

What are 3 main reasons manatees are endangered?

Habitat loss, cold stress and starvation caused by pollution-fueled loss of sea grasses (a major food source) have culminated in a large-scale, ongoing manatee die-off in 2021.

When did manatees become extinct?

The reclassification marked an astounding rebound for the animals, which hovered on the brink of extinction when they were first listed as endangered in 1973. Then, only a few hundred manatees remained.