Story highlights 15-month-old Budi was kept as a pet in Indonesia and was fed only condensed milk

When Budi arrived at shelter, his eyes welled with tears and he screamed in pain

Budi is now well enough to climb, walk and eat

(CNN) Budi, an adorable baby orangutan, is on the road to recovery after an animal shelter in Indonesia rescued him.

The 15-month-old was on the brink of death after he was kept in a chicken cage and fed nothing but condensed milk for the first year of his life. He had been kept as a pet in Ketapang, Indonesia, his caretakers said.

Now Budi is well enough to eat on his own, walk and climb.

"After weeks of physiotherapy, medical treatment and a nutritious diet, Budi's muscles are developing well," said United Kingdom-based International Animal Rescue

But Budi's development remains slow due to the extreme malnutrition, his caretakers said.

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