2. Characterization of animal species without emission estimation method

Some countries may have domesticated animals for which there are no Tier 1 default emission factors or Tier 2 emissions estimating methods (e.g., llamas, alpacas, deer, emus, ostriches, and rabbits).

Good practice is to first assess whether they are significant sources.  Approximate EF could be used to make the assessment (e.g., using an EF for an animal with similar digestive system and scaling the EF to differences in weight).  If the animal types are significant, emissions from such animals should be based on country-specific emission factors and animal characterization.