Some species, like camels, alpacas, and llamas, have evolved variant forms of immunoglobulin proteins that retain the ability to bind to antigens. While overall the antibodies made by these animals are simpler than human or mouse antibodies, an important feature conserved among all of these antibodies is:

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Camelid antibodies, such as those from camels, alpacas, and llamas, are known as heavy-chain-only antibodies (HCAbs) and lack light chains. However, they still retain two antigen-binding sites per antibody, similar to conventional antibodies.

Some Species, Like Camels, Alpacas, and Llamas, Have Evolved Variant