The Royal Zoological Society of Scotland (RZSS), which runs the park, has assembled a team to find and capture the missing macaque.
Keith Gilchrist, living collections operations manager at the wildlife park, said Cairngorms Mountain Rescue had “kindly offered to support” the search with their thermal imaging drone.
He also said the search team is responding to a sighting made on Tuesday morning.
“Throughout the day our expert team of animal keepers will be patrolling the local area using a variety of techniques to try and coax him in, as well as using our thermal image drone contractor to aid with the search,” he said.
Though the macaque is not presumed dangerous to humans or pets, experts have advised people not to approach the monkey and instead contact the RZSS’s hotline on 07933 928 377 with any sightings.
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Carl Nagle, 49, and his partner Tiina Salzberg, 50, saw the monkey from their patio doors in Kincraig near Kingussie on Sunday morning.
Speaking to Sky News on the UK Tonight with Sarah Jane Mee, Mr Nagle said: “I was woken by a telephone call by my daughter telling me there: ‘Dad, there’s a monkey on your street’.
“Apparently a video had been posted on Facebook in a neighbouring garden the macaque and I thought what were the chances of it being in our garden.
“So I got up, went to my patio door, and there I was in my dressing gown with a primate in my garden.”
He added: “He [the monkey] was and probably is still living his best life. He had a plentiful supply of food from my feeders and probably many more in the neighbours.
“We’ve all been asked to take them in now.”
Japanese macaques, also known as the snow monkey, are the most northerly living non-human primate, according to the Royal Zoological Society of Scotland.
It notes on its website that there is “a large group” of 34 primates at Highland Wildlife Park and it has had “great success” breeding the species.