A family in the US has made a jaw-dropping discovery after their daughter complained for months of “monsters in the wall” of her bedroom.

Ashley Massis Class said she tried to reassure three-year-old Saylor when her daughter started reporting the “monsters”.

“She was saying she heard monsters in her bedroom wall, but we’d been watching Monsters Inc.,” Massis Class told People magazine.

“She was a little speech delayed, so when she tried explaining it, we thought she meant there were monsters in her closet.”

Massis Class and husband Chris Class spent months trying all sorts of tricks to calm their eldest child.

“We told her, ‘Nobody is in that closet’. We made jokes about fighting the monster. We gave her a spray bottle full of water that was her monster spray,” she said.

Eventually last week, after noticing unusual numbers of bees around their 100-year-old farmhouse in Charlotte, North Carolina – including swarms near the attic and chimney – the family called in beekeepers.

“We noticed a couple bees when we were outside playing with the kids and then as the days progressed, we saw more and more and we thought, ‘That’s a little strange’,” Massis Class told Good Morning America.

The beekeeper noticed the insects were flying towards the attic floorboards – right above three-year-old Saylor’s bedroom.

He tracked the bees to a coin-sized hole in the floor before bringing in a thermal camera to scan the bedroom walls.

“It lit up like Christmas,” Massis Class said.

She has since shared a video to TikTok showing an image from the thermal camera highlighting the hidden hive.

It cuts to a shot of a gaping hole in the same wall, where tens of thousands of bees can be seen in the woodwork.

“When your daughter has been hearing ‘monsters’ in the walls,” she wrote over the clip, which has more than nine million views.

“Turns out it was 50,000 bees buzzing.”

The bees had spent eight months building the monster hive, which took several days to remove.

“They just came pouring out like a horror movie,” Massis Class said.

Husband Chris said the hive was so large that it “took up the entire wall space”.

The beekeeper has since removed up to 65,000 bees and 45 kilograms of honeycomb in three extractions over several days.

The bees are being relocated to a sanctuary.

Massis Class said the insects and honey had caused an estimated $US20,000 ($31,000) in damage, including to the house’s wiring.

The family’s insurer won’t cover the damage because it is considered preventable.

On Wednesday (Australian time), she shared another video to TikTok reporting the clean-up continued.

The family has to wait another two weeks before they can safely seal the hole in Saylor’s wall – and then repair her bedroom.