Chimp's maternal instincts awakened as she feeds milk to a baby tiger
They are humans' closest relative, sharing a similar genetic make-up and displaying behaviour not unlike our own.
Now this little chimpanzee is showing off a motherly instinct to rival even the most maternal of mankind.
These adorable images reveal the close bond that has formed between a two-year-old chimpanzee called Do Do and a two-month-old tiger cub called Aorn.
Maternal instinct: A two-year-old chimpanzee called Do Do feeds milk to Aorn, a two-month-old tiger cub
Completely at ease in each other's company, the ape's motherly instincts take over as she attentively bottle feeds the baby tiger.
Aorn gratefully laps up the milk as Do Do tenderly holds the tiger in her arms.
At one point, Do Do puts the bottle in her own mouth - almost mimicking the actions of a human mother checking to see if the milk is suitable for her offspring to consume.
For some unexplained reason Do Do is wearing a pair of denim shorts - perhaps to protect her thighs from Aorn's claws.
They were photographed at Samut Prakan Crocodile Farm and Zoo on the outskirts of Bangkok, Thailand.
Bonding: The animals both live at Samut Prakan Crocodile Farm and Zoo on the outskirts of Bangkok
For some unexplained reason Do Do is wearing a pair of denim shorts - perhaps to protect her thighs from Aorn's claws
The crocodile farm, used as a tourist attraction, houses some 80,000 crocodiles and is the largest in Thailand.
Its owners claim to hold the largest captive crocodile, measuring an astonishing six metres long and weighing 2,465lbs.
Regular crocodile shows are staged during which zookeepers place their heads inside the reptiles' mouths.
However, the farm doesn't just contain crocodiles.
As you'd expect from these pictures, monkeys and tigers also live there, alongside elephants, lions, horses and hippopotamuses.
Heat test: Do Do drinks some of the milk, perhaps to make sure the temperature is okay for the tiger cub
Aorn gratefully laps up the milk as Do Do tenderly holds the tiger in her arms