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if it leaves an environmental niche, then another, already existing, species might take that niche; or a new one might evolve to fill it.
its niche
Scavenger
Niche
The role of an organism in a community.
Tiger cubs don't have a niche. A niche is a role in the ecosystem, and tiger cubs don't fill any role in the ecosystem until they become independent. Adult tigers fill the niche of apex predator.
The role an organism plays in an ecosystem is its niche.
A niche can be a very small part of the ecosystem. The ecosystem in general is everything combined.
Ecological Niches are much more specific than 'Mammal'. For instance, Bears fill the top predator niche in lots of alpine forest regions; while mice fill a seed-eating small-creature niche in the same ecosystem.
if it leaves an environmental niche, then another, already existing, species might take that niche; or a new one might evolve to fill it.
Niche or Ecological Niche
Horse flies exist because they evolved from a common insect ancestor with other flies. They fill a certain niche in the ecosystem.
Scavenger
its niche
Fundamental Niche
A niche is place that a species fills. Plants fill a niche as herbivores eat them. Bacteria fill a niche as they decompose dead animals and help recycle them.
It's the predator.