Axe Beak Mount

[Deadspark]

I want to make a beast rider cavalier, but the Axe Beak doesn't show up in the druid animal companion list. Is there a way to have an Axe Beak as a mount without homebrew or third party?

[dragonhunterq]

4th entry down - PFS legal too (with restrictions)

[Brain in a Jar]

As long as you can your GM's approval for a Beast Rider to use Axebeak your fine.

Since it's a legal choice for a druid.

[Cat Whisperer]

I was looking to do this too. The only rules issue is that the Beast Rider states the mount can not have fewer than 4 legs.
My GM approved it, but some may not.