You guys are all comedians
Thanks for the comments.
Dennis, no filters were used. The sepia look was mainly a result of the processing I applied. I used "RawShooterEssentials" to process the RAW file, which included adjusting the colour temperature to give that colouration, and the shadow contrast and highlight contrast were adjusted to give the silhouette. In the original shot, the birds weren't a complete silhouette.
Thanks