sentence: Most male birds have no sex organs that can be seen.
sentences_after: But inside the male are two testes which produce sperm which is stored in the cloaca. Birds mate by rubbing their cloacas together, although with some birds, particularly large water birds, the male has a sort of a penis inside the cloaca.
concept_name: male bird
headings: Bird Behaviour Nesting
categories: Basic English 850 words