Being delighted by watching cute animals like puppies and kittens is common human behaviour. Now science presents evidence supporting the feelings for animals.

A study jointly conducted by the University of Leeds in the United Kingdom and the Western Australia Tourism has found evidence that watching cute animals may help a reduction in stress and anxiety, reports CNN.

The study examined how blood pressure, heart rate and anxiety are affected by watching images and videos of cute animals for 30 minutes.

Dr Andrea Utley, an associate professor at the University of Leeds, put together the 30-minute montage of the cute critters.

"There were some kittens, there were puppies, there were baby gorillas. There were quokkas. You know -- the usual stuff that you would expect," Utley told CNN.

The quokka, an adorable creature found in Western Australia, is often referred to as "the world's happiest animal."

The sessions, conducted in December 2019, involved 19 subjects -- 15 students and four staff -- and was intentionally timed during winter exams, a time when stress is at a significantly high level, particularly for medical students, according to Utley.

In all cases, the study saw blood pressure, heart rate and anxiety go down in participants, 30 minutes after watching the video.

The study recorded that average blood pressure dropped from 136/88 to 115/71 -- which the study pointed out is "within ideal blood pressure range." Average heart rates were lowered to 67.4 bpm, a reduction of 6.5%.

Anxiety rates also went down by 35%, measured using the State-Trait Anxiety Inventory, a self-assessment method often used in clinical settings to diagnose anxiety, according to the American Psychological Association.

"I was quite pleasantly surprised that during the session, every single measure for every single participant dropped some -- heart rate reduced, blood pressure reduced," Utley said. "When they left, they filled the questionnaire in again and indicated that they were feeling less anxious."

When questioning the participants, the study found that most preferred video clips over still images, particularly of animals interacting with humans.

Utley hoped to conducted eight sessions in total but was forced to postpone due to coronavirus restrictions. She acknowledges it'll likely not be until next year that more sessions can be conducted in person. Until then, she's exploring online options to keep the study going.