Extinction.
There is probably a more complicated answer, but if animals can't reproduce, they go extinct.
An extinction event.
This term is extinction.
Extinct (Extinction)
The extinction rates of terrestrial and freshwater organisms varies per location. This is largely dependent on other growing and declining populations.
They could not hibernate or go very long without resources.
The process in which groups of organisms die out is called extinction. Extinction occurs when a particular species cannot adapt to changing environmental conditions or faces competition from other species, leading to their eventual disappearance.
Extinction
Extinction is a natural part of the theory of evolution. It occurs when a species is no longer able to adapt to its changing environment or faces competition and is unable to survive. Extinction can lead to the evolution of new species as surviving organisms adapt to fill the ecological niches left by extinct species.
The disappearance of all organisms of a specific species would be called extinction. This event can have significant ecological impacts on the ecosystem that the species once inhabited.
The extinction of so many organisms left a large ecological niche to expand into, which mammals did.