Well I for one applaud that they are having a go at hand rearing just 2,and to give the mother a fair crack at the whip to try and naturally feed the other 2. It will a big drain on resources too if they have to lose a keeper from their staff,for a considerable length of time, just to try and raise the 2 pups.
They live in one of their better enclosures,with quite a lot of swimming room. Admittedly when I was there one of the otters was scaling a fir tree as a vantage point,not very tropical rain forest,but heyho.

Lets give praise where its due folks.
(I would love to see these at YWP to compliment their South American Viva exhibit but I fear the area it would fit perfect in has been ear-marked for another picnic area.

)