Caption: Male Lion (Panthera leo) striding out, determined not to let the female in estrus escape his attentions, Mashatu Game Reserve, Tuli Block, Botswana. © Scotch Macaskill

Camera: Canon EOS 400D (Digital Rebel XTi); Lens: Canon 70-300 F4-5.6 IS USM; Focal Length: 85mm; Shutter speed: 1/1000; Aperture: f5.6; ISO: 400.