Bird Equipment Facebook Promotion

I need help promoting my specialist bird equipment business on Facebook, targeting specific bird-related groups I provide.

Requirements:
- Use our existing animated advert content for organic posts
- Target only the specified groups
- Cost-effective strategies preferred

Ideal Skills and Experience:
- Experience with Facebook organic posting
- Familiarity with Facebook groups and targeting
- Ability to optimize existing content for engagement

Please provide examples of similar work done and a brief strategy outline.