Possible Clues:

• Source of some tweets
• A change required around island feature of zoo
• Building with many wings
• Sparrows' space
• Arrive originally by means of railway to see bird enclosure
• London Zoo’s Snowdon ____ is being repurposed to house colobus monkeys
• A verbose leader from The Journal needs no introduction, as it's for the birds
• House with many bills?
• Where many a flap occurs?
• Where birds are kept