Which amino acid is next most common in all three animals?

To determine the next most common amino acid shared among three specific animals, one would typically analyze their protein or genetic sequences. Common amino acids in many species include leucine, alanine, and glycine, with leucine often being highlighted for its prevalence. However, without specifying the animals in question, it is difficult to identify the exact amino acid that would be next most common. Generally, leucine tends to be a strong candidate across various species.