スミソニアン国立動物園のインスタグラム(smithsonianzoo) - 12月7日 03時15分

“Our birds receive frequent check-ups from the Zoo’s veterinarians, but animal keepers are on the front lines of monitoring the birds’ daily health. Since feathers obscure birds’ bodies, it is difficult to observe visually if a bird is gaining or losing weight. Instead, we rely on positive reinforcement training to get weekly or monthly weights on them. In this photo, animal keeper Heather Anderson is coaxing a black-crowned night heron onto a scale in its enclosure. A main component of positive reinforcement training is choice; the heron can choose to voluntarily climb on the scale or walk away. If he chooses to participate, Heather rewards him with a treat. If not, she will try the training at another time when he is in the mood to participate.”-Eric Slovak, assistant curator of Bird House

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