article_snippet.sent: The avocado tree is 'transgender' and has overnight sex changes, a botanist has discovered.
article_snippet.sent: Professor John Warren Professor John Warren discovered avocado trees switch from male to female in a matter of hours.
article_snippet.sent: Professor John Warren Professor John Warren discovered avocado trees switch from male to female in a matter of hours .
article_snippet.sent: avocado trees are usually successful in avoiding the 'sin' of inbreeding.'
article_snippet.sent: Professor John Warren Professor John Warren has written about the avocado in Professor John Warren book called the Nature of Crops.
highlights_snippet.sent: Professor John Warren discovered avocado trees switch gender in hours .
  
highlights_snippet.sent: However, trees are usually successful in avoiding polinating trees .