That would probably be a marten. "Arboreal" means 'of or relating to trees,' "musteline" is from the word 'mustelidae,' which is a family of animals that includes badgers, ferrets, weasels, martens, skunks, otters, and wolverines. If you Google "pine marten" you will see many great examples.
Goat
kinkajou, is an arboreal fruit-eating mammal of Central and South America, with a long prehensile tail. Also known as a sugar Bear or Honey Bear.
genet
Genet
Red squirrels can run up to 14 miles per hour (22 km/h) in short bursts. They are agile and quick, which helps them navigate their arboreal habitat efficiently and escape from predators when needed.
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agile
A monkey is very agile and dangerous.
sleek and agile as a gymnast
Agile Property was created in 1985.
Agile - producer - was born in 1975.
Agile mangabey was created in 1886.