Okay so I was perusing to my pocket change and every once in awhile I go searching for something unique and I'll find it I don't know why something told me to go look at this and I did and this is what I found so apparently where the bird is in the sun rays the bird has an extra cud of metal over its head... hopefully my pictures do it justice...
Hello. Thanks for sharing. Your title is incorrect. It is 25 Cents not 25 Euros But, that is not a cud. That is a small die chip. It is a die deterioration issue. Neat but nothing really major. A true Cud always involves the rim and flows into the field. Anything else are IDB's or Interior Die Breaks such as Die Chips. Here is an example of a well-known Cud on a 1970 S Cent Here is a well-known book on Cuds. I have one..
As always, Mr. Ed is the paramount expert regarding errors and coin anomalies, but I perceived OP's photogs as being more 'clipped' in nature.
I don’t think there is anything at all. The bird is supposed to have a bit of a crest and what you’re seeing in the first image is just a matter of the lighting. The other two images show a normal coin as far as I can tell.