The fact that non-human animals live an existence of violent survival does not seem to be prima facie evidence for the nonexistence or incoherence of human morality.
Human beings are rational animals. The term rational here is being used in a specific and technical sense. Non-human animals are subject to the laws of nature in a manner that acts more directly on their passions. Human beings are also subject to the laws of nature, but the forces of nature are mediated by our rationality.
Animal Act: (1) Offspring are hungry (2) brings food to offspring
Human Act: (1) Offspring are hungry (2) Reflects and Decides to provide food (3) brings food to offspring
An act is deemed immoral if it is a misuse of the rational faculty for ends that are not in conformity with the laws of nature.
Human Act (immoral): (1) Offspring are hungry (2) Reflects and Decides not to provide food for selfish reasons (3) offspring go hungry
Animals suffer but they are not moral agents like human beings since there is no mediating rationality that can be misused for ends that are not in conformity with nature's laws. The phrase Nature's Laws is being used broadly to include physical, biological or evolved social laws intertwined with the essential characteristics of the species.