• E161g Canthaxanthin – A pigment found in mushrooms and flamingo feathers.
• E236 Formic acid – An acid that’s found naturally in the bodies of ants; it’s also produced synthetically.
• E237 Sodium formate – The sodium salt which is manufactured from formic acid, so may come from ants or a synthetic source. 
• E238 Calcium formate – The calcium salt of formic acid, so may come from ants or a synthetic source.
• E252 – Potassium nitrate – This occurs naturally, or is manufactured from animal or vegetable waste. 
• E422 – Glycerol / Glycerin – This may be produced from animal fats. 
• E474 Sucroglycerides – This can come from several sources, including lard, tallow and palm oil.
• E570 Stearic acid – This comes from animal fats and vegetable oils.
• E572 Magnesium salts of fatty acids – This is produced from stearic acid, which can be from both an animal and vegetable source. 
• E627 Guanosine 5-disodium phosphate – This can come from both sardines and yeast extract.
• E631 Sodium 5'-inositate – This can come from dried sardines and extracts of meat.
• E635 Sodium 5'-ribonucleotides – This may have animal origins.
• E640 Glycine and its sodium salt - This can originate from gelatine.
• E910 – L-Cysteine – This can be extracted from the feathers from ducks and chickens. 
• E920 L-cysteine and L-cysteine hydrochloride - The L-cysteine part of this can be extracted from the feathers from ducks and chickens. 
• E921 L-cysteine Hydrochloride Monohydrate – The L-cysteine part of this can be extracted from the feathers from ducks and chickens.


http://www.exploreenumbers.co.uk/E-Numbers-with-Animal-Origins.html