You mean, How do different animals ingest their food?
From microbes to blue whales, almost every animal on the earth consumes food through a mouth of some form. It may also be referred to as an oral groove, mouth, or piehole. It is located at the front of the alimentary canal, while the anus is at the back.
Deuterostomes and protostomes are actually separated based on which end of the alimentary canal formed first: in the case of deuterostomes, it was the mouth, whereas in the case of protostomes, it was the anus.
To put it simply, almost all animals eat with their mouths.
Just for humor, you may ask how do plants eat?
In contrast to animals, plants do not "eat" in the same sense. Animals are heterotrophs, which means they "nourish through others," but plants are autotrophs, which means they "nourish themselves."
Animals consume and digest the organic matter found in other life forms, such as plants, animals, or both, in order to get all the energy and nutrition they require. Additionally, in order to convert the food they consume into energy, they need oxygen, and as waste, they exhale inorganic carbon dioxide and other substances. With the exception of water and a few mineral salts, they are largely unable to utilize inorganic stuff.
Contrarily, plants get all the energy they require from the Sun through photosynthesis, and the nutrients they require are inorganic rather than organic. These include water, carbon dioxide, inorganic nitrogen (in the form of nitrates, nitrites, and ammonia salts), phosphorus (in the form of phosphate salts), and a variety of other minerals found in the soil. Oxygen is a significant waste product of plants. (Which, from the perspective of animals, is very convenient.)
TL;DR
The energy from the sun powers all the necessary biosynthetic pathways, which transform the inorganic matter that surrounds them into the organic matter they require and are made of. Plants don't eat; instead, they feed on the resources that are available in their environment.
Thanks!