It could be fiberglass, but then it would much more likely crack.
Much of aircraft skin is made of thin aluminum. Not very tough, but much more malleable than fiberglass or most composites. It bends, doesn’t break, like this.
Yes, the skin of the fuselage is made of aluminum, but the nose cone isn’t (there is a radar behind the cone).
A spokesperson for Turkish Airlines told MailOnline Travel: ‘The damage of the nose area (radome) by bird hit is a common incident on civil aeronautical operations.
‘The radome area of a plane is constructed by soft materials (composit) to minimalize the impact of such hits.
‘Therefore, such standard/normal deformation occurs as a natural result of such incidents.