On Sunday, Reynolds took to photo-sharing website Instagram to share two images taken during the outing.
In one of the images, the 38-year-old could be seen getting close with a giraffe and then planting a kiss on its nose as the animal peeped inside his car to eat leaves, reports aceshowbiz.com.
"I specifically said, 'No tongue'", he quipped in the caption's image.
The other photograph, meanwhile, featured Reynolds bonding with a tortoise.
"This is Brutus. He's over 110 years old. He's telling me his life story. But in real time," read the accompanying caption.