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Microorganisms
Microorganisms refer to microscopic life-forms such as amoebas, bacteria or single-celled organisms. Despite their infinitesimal size, microorganisms can threaten the well-being of other species in the habitat, especially if their population becomes disproportionately large. Microorganisms can spread disease among animal populations; humans are also vulnerable, having had their own habitats disrupted many times throughout history by bacterial and viral diseases.
Predators
Large predators are a threat to weaker species and creatures below them on the food chain. Big cats such as tigers and leopards are, in their natural habitats, skilled, instinctual hunters and can eliminate prey species in the habitat, thereby disrupting the living conditions of species coexistent with the big cats' prey. This is especially true if their populations go unchecked. For example, large predators who prey on small mammals and rodents (who feed on other species and keep those species' populations in check) disrupt the ecological balance.
Non-Native Species
Non-native species or introduced species are organisms that are inserted into a habitat by unnatural means. Non-native species can wreak havoc on the ecological balance between species and resources in a habitat. For this reason, governments around the world impose strict rules about flora and fauna that can be imported.
Other Harmful Organisms
Fungi serve important biological functions within a habitat, but they can also become harmful. Some species of fungi are parasitic, and if they run amok in a habitat, they can choke out the supply of natural resources and stifle the life of other creatures. Venomous creatures represent another threat. Anemones and jellyfish are two such examples of organisms whose natural toxin-injecting capabilities present a danger for coexistent species, even those that aren't prey animals for the venomous creatures.