No "laughing" matter, in Africa a dozen  of these can reduce a 500-pound zebra to bones in 30 minutes
[DOC] [TLE] Reticulated Giraffe (Giraffa cameloparadalis) - Jackson Zoo [PAR] Oct 31, 2003 ... Range/Habitat: Central, Eastern and South Africa; open grasslands ... Giraffes 
spend 16 to 20 hours a day eating and only need 5 to 30 minutes of sleep.