Student or Learner
Martin Hewings' ADVANCED GRAMMAR IN USE (2004 edition) CD ROM, Unit 43 contains the phrases of 'duck's eggs', and 'lamb's chops'.(The writer wants us learners to fill in the blanks with these phrases.)
But we often say 'bird eggs, duck eggs, chicken eggs, lamb chops', all without 's. In which ever way do native speakers say these things? Thanks.