Figure 3. The projected Phinda elephant population divided into age classes represented as absolute numbers under different immunocontraception scenarios.

The age classes are classified as 0–2 years: infant, 2–4 years: juvenile, 5–8 years: intermediate, 9–12 years: sub-adults, older than 13 years are classified as an adult. Adult bulls are presented by white bars (with only two age classes), while all the individuals in the breeding herds are represented by the black bars which include males <13 years. (a). The Phinda elephant population in 2006 before any effects of immunocontraception had taken affect. The projected Phinda elephant population in 2026, (b). without any application of immunocontraception. (c). with a 100% application of immunocontraception. (d). with a rotational application of immunocontraception, as the current Phinda implemented immunocontraception plan.