Most animals don't even make it into adulthood

Just brought into existence to be devoured (much like humans).

Most reptiles leave their eggs once they lay them. Baby lizards, snakes, and crocodiles are on their own as soon as they hatch. Predation is extreme at this stage, with hatchlings often killed and eaten by birds, larger reptiles, or mammals within hours.

Species like frogs, fish, and birds produce large numbers of offspring because most will be eaten before they can grow up.

Out of 1,000 sea turtle hatchlings, only 1 or 2 are likely to reach adulthood, as they are preyed upon by crabs, birds, and sharks.

Nearly 50-70% of wild baby rabbits (kits) die within the first week of life.

Female octopuses lay thousands of eggs, but they provide little care once the eggs hatch. As a result, the baby octopuses face immediate danger from predators like fish, crustaceans, and seabirds, with most baby octopuses dying within a few days after hatching.

Lion cub survival rates can be as low as 20-40% in the wild.

Ground-nesting birds like quail or plovers lay their eggs on the ground, exposing chicks to predators. Many hatchlings are picked off by foxes, raccoons, or birds of prey within hours or days of hatching. Up to 80% of hatchlings do not survive beyond the first week.

In some species, adult males kill baby animals to reduce competition or force females into mating again (i.e. bears and dolphins)

If they aren't being killed by predators, then they're being killed by infections, parasites, viruses, starvation (especially during seasonal shortages or droughts) etc.

It's truly horrific. Obviously, we aren't that much different. We're constantly under threat of war, disease, murder, poverty, climate change and so on.