WASHINGTON (AP) — The National Zoo says a red panda likely escaped from its enclosure this week by climbing through tree limbs to reach bamboo nearby.

The zoo announced Friday that it conducted a thorough assessment of the enclosure and reviewed photos and security footage. The male red panda named Rusty was found Monday afternoon along a sidewalk and later in a tree in Washington’s Adams Morgan neighborhood.

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Animal care staff believe Rusty left his exhibit Sunday night or early Monday through the tree canopy. Zookeepers say rain may have been a factor. The rain had lowered tree limbs in Rusty’s exhibit, allowing him to reach tall bamboo outside of the exhibit.

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No red panda tracks were found outside the exhibit, so zookeepers couldn’t determine the exact route of Rusty’s escape.

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