Etorphine-Azaperone Immobilisation for Translocation of Free-Ranging Masai Giraffes (Giraffa Camelopardalis Tippelskirchi): A Pilot Study

A giraffe can become more excited after receiving an immobilising drug. During capture, the period between darting and lying down can include sudden running rather than a steady slide into stillness. That exertion matters because moving giraffes safely requires protecting their breathing and body chemistry as well as preventing falls and injuries.

Francesca Vitali, Edward Kariuki and colleagues monitored nine free-ranging Masai giraffes being moved from Kenya’s Lake Naivasha area. They recorded reactions before darting, excitement afterwards and recovery, alongside breathing, heart rate and other measurements. Blood samples from seven animals allowed a closer check of oxygen levels and acidity. An opioid and a tranquilliser were used together, with the opioid reversed promptly once the giraffes were down.

The stronger the excitement after darting, the longer capture took and the lower the blood bicarbonate, which helps buffer acidity. The initial reaction to the approaching vehicle did not show the same relationship. All nine giraffes recovered smoothly and remained healthy during 14 days of observation, although all seven blood samples showed metabolic acidosis. This small study had no comparison treatment, so it cannot isolate the tranquilliser’s benefit. It distinguishes two capture challenges that can look similar: reacting to people and becoming excited after the drugs take effect.