Seikret are Bird Wyverns introduced in Monster Hunter Wilds. The mount given in Monster Hunter Wilds

Adult Seikret are green, bipedal dromeosaurid-like creatures covered in feathers. The color and pattern of the plumage on the Seikret's entire body can change depending in its diet, resulting in a multitude of different shades and colors; this can allow its owners to customize their own Seikret's hue to their liking. Its front arms are small, but can still be used to run in a quadruped stance. These arms can also unfurl into wings, allowing it to glide.

Seikret chicks are small and rotund with fluffy white feathers, smaller beaks and short forward pointed crests on their heads.

https://monsterhunter.fandom.com/wiki/Seikret