The incessant “eep, eep, eep” of hundreds of hungry flamingo chicks bounces off the concrete walls of a feeding room at the SANCCOB wildlife sanctuary in Cape Town, South Africa. Teri Grendzinski reaches into a pen and plucks out a fluffy, pale pink chick. She grips it gently with one hand. The bird opens its mouth eagerly as her syringe squirts out a kind of warm shrimp milkshake.

It’s noisy, hot work. To keep the chicks warm away from their nests, their rooms are heated to a balmy 86 de