A mum has left people in stitches after sharing a side-by-side comparison of the birthday cake her daughter had asked her to make and the one she ended up with.

The little girl had picked out a buttermilk duck cake from her mum's cookbook, and asked her to make it in time for her seventh birthday celebrations on Christmas Eve.

The cake in the book was finished with popcorn to resemble feathers, two crisps for a beak, and liquorice for eyes, but her daughter doesn't like buttermilk so the mum switched it for chocolate instead.

But, unfortunately, it didn't quite go to plan and the mum shared an hilarious photo on Facebook to show a red-eyed, angry-looking duck with no neck and a popcorn hairdo, as reported by Kidspot.

The picture in the cookbook compared to what she ended up with
It's almost identical
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The scary looking duck she made
Other parents said they could relate to her efforts

Luckily she was able to see the funny side and uploaded the post with the caption: “OK all, please don’t laugh. My daughter turned seven on Christmas Eve and wanted a duck cake.

"She doesn’t eat buttermilk cake so Woolies mudcake hack to the rescue… #nailedit.”

And people loved her efforts, as one commented to say: “This is the best, funniest cake I’ve ever seen. I love it. It’s ‘quacktastic’."

A second wrote: “Who needs a neck anyway!"

Another asked: "How many chips did you search through until you got the perfect beak?"

And others said the thought and effort that had gone into attempting the cake was all that mattered, commenting: "This seriously made my day. I can fully relate. Made with lots of love."

Someone else added: "You’re a champion mum, nailed it hard."

Have you ever experienced an hilarious parenting fail? Let us know in the comments.