Ethan Walker 
Invasive carp are non-native freshwater fish that can spread through rivers and lakes and change how those ecosystems work. In North America, the phrase usually refers to four species: bighead carp, silver carp, grass carp, and black carp. They are often discussed together, but they are not the same fish and they do not cause … Read more
Burmese pythons in Florida are large, nonvenomous constrictor snakes that have become established in South Florida, especially in and around the Greater Everglades ecosystem. They are invasive there because they are not native to Florida, can reproduce in the wild, and prey on native animals in a fragile wetland system. The Florida Fish and Wildlife … Read more
Invasive animals in the US are non-native animals that establish populations and cause, or are likely to cause, ecological, economic, agricultural, or health-related harm. Some are large and obvious, such as feral pigs tearing up wetlands and farms. Others are small or easy to overlook, such as zebra mussels covering native mussels and water infrastructure. … Read more
An invasive species is a living organism that is outside its native range and causes, or is likely to cause, harm in the place where it has been introduced. That harm may affect native wildlife, habitats, agriculture, local economies, human health, animal health, or plant health. The key point is that non-native and invasive do … Read more
Invasive animals are non-native animals that establish in a place where they did not naturally live and cause, or are likely to cause, harm. That harm can affect native wildlife, habitats, farms, waterways, pets, people, or local economies. The key point is not that the animal is strange, aggressive, or from another country. The key … Read more
Animals shape their habitats when their daily behavior changes the physical places where other organisms live. A beaver dam can turn moving water into a pond, coral polyps can build reef structure, prairie dog burrows can open underground shelter, elephants can push paths through dense vegetation, and woodpeckers can leave tree cavities that other animals … Read more
Apex predators explained simply: they are predators that sit at or near the top of a food web and have few regular natural predators as healthy adults. That does not mean they are invincible, constantly hunting, or automatically the most dangerous animals to people. It means their usual ecological role is to hunt other animals … Read more
Scavengers and ecosystem cleanup are closely connected because every natural habitat must deal with dead animals. A carcass is not just waste. It is a temporary food patch, a nutrient package, a meeting place for competing animals, and eventually a part of the soil or water again. Scavengers are the animals that enter this process … Read more
Why biodiversity matters comes down to one simple idea: ecosystems work better when many different living things share the work of staying alive. A forest, prairie, coral reef, river, or backyard pond is not balanced by one impressive animal alone. It is shaped by predators, prey, pollinators, seed dispersers, grazers, scavengers, decomposers, parasites, microbes, plants, … Read more
Trophic cascades are chain reactions in food webs. They happen when a change in one trophic level, such as predators, herbivores, plants, or tiny plankton, indirectly changes other levels. A predator can affect plants by changing how many herbivores are present or how those herbivores behave. A change in plant growth can also move upward … Read more
