You should think that most cattle birds never heard about this injunction. They use African Buffalos as landing strips and these big cows as as source of food while they remove the parasites from their skin.
African Buffalos (nearly) without birds
African Buffalo - Copyright 2008 Y.Roumazeilles
African Buffalo - Copyright 2008 Y.Roumazeilles
Buffalos and birds
Here, we see a fast airplane in final approach, or is it in attack phase?
African Buffal and birds: Tora! Tora! Tora! - Copyright 2008 Y.Roumazeilles
Finally, here the one I prefer (“the airport is not happy“) :
African Buffalo and birds - Copyright 2008 Y.Roumazeilles
African Buffalo (Syncerus caffer, Buffle d’Afrique, Búfalo negro). Kenya, Masai Mara, September 2008.