Western pond turtles are omnivorous and most of their animal diet includes insects, crayfish and other aquatic invertebrates.

When cooked, purslane is believed to have 10 times more linolenic acid than is found in spinach and that is considered essential in animal diets.

An animal diet containing common sainfoin is able to reduce nematode (e.g. Haemonchus contortus) parasitism in ruminant's guts.

The US Food and Drug Administration approved a selenium supplement to animal diets, however the most common form is sodium selenite for pet foods.

It is highly adapted to vertical clinging and leaping, like other tarsiers, and has a strict live animal diet, mostly insects with some small vertebrates.

The majority of the black bear's animal diet consists of insects such as bees, yellow jackets, ants and their larvae.

It is widely used as a filler and source of protein in animal diets, including pig, chicken, cattle, horse, sheep, and fish feed.

Increasing the concentration of inorganic minerals in animal diets has led to several problems.

However, since methionine is an essential amino acid, it should not be entirely removed from animal diets without disease or death occurring over time.

The deaths and following media coverage sparked a review in necessary animal diet that is yet to be conclusive.