refactor fill_species_configs

[chrisroadmap]

Pull request

Please confirm that this pull request has done the following:

• Description in CHANGELOG.rst added

Adding to CHANGELOG.rst

DONE

Fixes #151

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c09bee8) 95.08% compared to head (83a3177) 94.92%.

❗ Current head 83a3177 differs from pull request most recent head 3a6b5b0. Consider uploading reports for the commit 3a6b5b0 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #152      +/-   ##
==========================================
- Coverage   95.08%   94.92%   -0.16%     
==========================================
  Files          19       20       +1     
  Lines         732      709      -23     
  Branches      105      106       +1     
==========================================
- Hits          696      673      -23     
  Misses         16       16              
  Partials       20       20              

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