Gorillas don't care what season it is; they just know what they like.

The ones at Werribee Open Range Zoo in Australia happen to like Michael Bublé's album Christmas. In fact, they like it so much that the zookeepers play it for them all year round.

The gorillas must have been thrilled, then, when the Burnaby-born crooner himself paid a visit to the zoo during his recent tour of the Land Down Under and serenaded them with some not-exactly-seasonal tunes. Or, more likely, they wouldn't be able to tell Michael Bublé apart from Robin Thicke. They are gorillas, after all.

In the video below, gorilla keeper Ben Gulli explains the singer's particular appeal to the primates:

So, when we play Michael Bublé's CDs, the boys will instantly start pleasure grumbling and sit nice and calm and relaxed. Our theory is it's the beautiful low tones that he sings with kind of mimics their pleasure grumble. And they've even been shown to hum little food songs when they eat, and we think he must really resonate with that sound.