Biologists on Twitter are trying to find the most impressive animal butt.
Chipmunk, because #wildbum needs more rodents.
Gabriella, a 26-year-old biologist from the University of Edinburgh, told BuzzFeed News that it all started on Thursday evening with a photo of a musk duck bum.
.@Lee__Mc @AnneWHilborn Musk duck bum! I feel like this deserves a hashtag. #WildBum?
"It started innocently enough," she said. "[It] was born out of all of those photos where no matter how hard you try you end up with a blurry shot or a bum shot of the animal."
"For each decent photo there will be dozens, sometimes hundreds of misses - and a lot of them are bum shots."
Biologists started sharing their own pictures, and the #WildBum competition was born.
Some bums were magical looking, like this sea urchin's.
Of course, not all bums look alike...(Astropyga radiata) #wildbum @AmidstScience
Some bums were really big.
If we are doing this then zebra #wildbum is best #wildbum
Really big!
Not a shark, but definitely our best #wildbum photo!
And some were really small.
By far the cutest #wildbum I've seen, here's a baby sooty mangabey being enthusiastically groomed by his mother.
Other bums were hard to miss.
Who are you looking at?! Pronghorn does. #wildbum
Some animal bums were probably best to admire from a distance.
A #wildbum you DO NOT want to get close to...
But doesn't mean they were any less bootylicious, like the toned bum of this Sitatunga.
Sitatunga says: "Does my bum look big in this river?" #wildbum #animals
And this spiky Turtle backside.
.@TaskForceTurtle @AquaTurtlesRule Three can play at that game #wildbum #spikybum #teamturtle
Other bums were cute and fluffy.
Did someone say #wildbum?
This Marmot had a nice round one.
Ok, lets leave Oz #wildbum for a sec. How about a marmot one?
Some biologists couldn't wait to share their favourite animal bums...
Been waiting my entire Twitter life for #wildbum to come around! Marvellous female Mallard, uncommonly elegant.
Like the flamboyant backside of the red shafted northern flicker.
Here's my addition to #wildbum Red shafted Northern Flicker 😃
And the beautiful blue bum of this Steller's Jay.
Wait...what? #wildbum is a thing today? MY TIME HAS COME! Steller's Jay #becurious
The Antarctic fur seal pup has a cute and squidgy one.
An #Antarctic fur seal pup's #wildbum: all fur and flippers.
Thank you, biologists, for sharing such fabulous booty!
This hartebeest was proudly shaking his derriere #wildbum