The tiny bunny was brought to the foundation this summer. He was so young that part of his umbilical cord was still attached.
"He was very weak and we honestly didn't expect him to make it," the foundation wrote on Facebook.
Slowly but surely, the sweet little guy started to show signs of improvement despite serious seizures and other setbacks.
A few weeks later, a woman contacted the foundation after discovering a pigeon's nest on the ground. A newly hatched chick and unhatched egg were found inside, and luckily the chick appeared to be unharmed.
Both the tiny chick and bunny needed an incubator for warmth, but the rescue only had one available. A volunteer placed a small divider down the middle, with one vulnerable baby on either side.
"Imagine our foster carer's surprise when she next checked them and discovered that the divide had been overcome and these two had decided that life together was better than life apart," the group wrote.
"The comfort of two heartbeats together, of companionship, has crossed the species divide."
The bunny, aptly named Bunny, and Pidg have been inseparable ever since, always curling up and snuggling with each other after every feeding.
The adorable critters are getting stronger every day and will one day be released back into the wild.
Kruger National Park, South Africa. (Photo by Heinrich van den Berg via Getty Images)
(Photo by Albert photo via Getty Images)
Friends sitting in the sun, Kalahari, South Africa
(Photo via Shutterstock)
A lamb and a cat playing draughts, watched over by a bantam, at Langford, Somerset. (Photo by Fox Photos/Getty Images)
Dog Poppy and meerkat Timon in the bath at their home on July 14, 2011 in Dronfield, England. This meerkat and dog have been inseparable ever since four-year-old Timon was sent packing by his meerkat mob. The friendly animal found comfort in the arms of owner John Bent's dog, Poppy, and the unlikely pair have formed a mob of their own - which includes John, his wife, Sally, and their two children. You wouldn't expect a meerkat to be friends with a dog, explained hospice service manager Sally. They tend to stick very much to their own kind. The couple, from Dronfield in Derbyshire, has a collection of exotic critters, which started with a pair of skunks three years ago. Since then their menagerie has grown to include meerkats, raccoons, coatis and kinkajous. However, it is the relationship between six-year-old Chihuahua-Maltese Terrier cross Poppy and Timon, which is most surprising. The are inseparable, said John, who owns a surface coating company. Timon came into the house and instantly struck up a relationship with Poppy, who is just about as small a dog as you can get. Now they do everything together. They go for walks together and play together until they fall asleep on the sofa together. (Photo by Nick Obank / Barcroft Media / Getty Images)
Shere Khan the tiger, Leo the lion and Baloo the bear play outside at the Noah Ark Rehabilitation Centre in LOCUST GROVE, GA. Known as the BLT, or Bear, Lion and Tiger, these most unusual and unlikely animal friends are having to go on a diet after being spoilt too much. For not only do Baloo the bear, Leo the Lion, and Shere Khan the tiger have an unnatural bond, they also have a remarkable appetite too. Devouring almost 100 pounds worth of meat and vegetables a week between them, the rescued big beasts had developed something of an obesity problem. Staff at Noah's Ark Animal Rehabilitation Centre in the state of LOCUST GROVE, GA, decided to stop indulging their favoured guests and to put them on a diet after they each gained 100lbs. (Photo by Barcroft USA / Getty Images)
KATMAI NATIONAL PARK, AK - UNDATED: ***EXCLUSIVE***A female coastal brown bear and one-year old grey wolf relax together after fishing for salmon at the Hallo Bay estuary in the Katmai National Park, Alaska. In the seemingly most unlikely animal partnership ever this wild brown bear and grey wolf look just like they are fishing buddies. Showing a heartwarming moment when the pair - both wild -decided to forget their differences, the bizarre duo took an end-of-day break together just three feet apart. Both had spent hours trying to land a big catch during the first day of the annual salmon run in the remote Alaskan wilderness at Hallo Bay estuary, Katmai National Park. The pair - a 700lb female bear and one-year-old wolf - were both spotted by photographer Chris Dodds, 42, from Franklin Centre, Canada. He said: 'They were just three feet apart and they didn't seem the slightest bit worried about each other. It was very unusual. They looked just like a pair of fishing buddies and stayed together like that for at least two hours.' (Photo by Christopher Dodds / Barcroft Media / Getty Images)
Great Egret standing on the back of an alligator . (Photo by: Universal Education/Universal Images Group via Getty Images)
Unlikely friends Green parrot dog and cat Venezuela. (Photo via Alamy)