It fills fat mexicans.
Birds have evolved to fill that ecological niche.
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.
They fill an ecological niche. There isn't any particular "reason" for it.
All organisms evolve to fill a specific ecological niche, which in the case of cheetahs is the hunting of other animals.
Because most species of gecko will fill similar ecological niches, and it is the most succesful design for filling said 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.
The extinct dog-like mammals are from a biological family of carnivorous mainly called Canidae. The Canidae includes almost 34 species from the manned wolf to bush dogs (short in length).
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.
They fill a space (niche) in a food web.
some do. You can find a similar placental mammal for every marsupial animal. Example: Kangaroos fill the same niche as North American deer. etc.
Herbivores?
this way the adult fill a different niche then the larvae and so do not compete with them.