Some battles end in defeat, and sometimes that defeat can be costly. Lions chasing bisons can get gored and wild dogs that hunt stags may lose an attacker even in eventual victory.
Spiders that go after prey that are too nasty for them can end up in a bad way.
Metadata Canon Powershot G11. ISO 200. f/4.0 at 1/800 second and f/4.5 at 1/400 second. Edited using Picasa 3.8 and Adobe. Taken in December 2010 at my workplace near Bommasandra on the outskirts of Bangalore, India.