What unusual method of communication has been observed in herring? The Weekend quiz

The questions

1 Whose father was Pepin the Short and his son Pepin the Hunchback?
2 Which country has provinces called East and West Azerbaijan?
3 What unusual method of communication has been observed in herring?
4 Samhain was a Celtic precursor to which festival?
5 Carol Ann Duffy’s poem Long Walk marked what event?
6 Who made his last stand at Glenrowan, Victoria, in 1880?
7 What project offers 57,000 free eBooks online?
8 What decorative item might have a knop, column, sconce and pricket?
What links:
9 Claudia Johnson; Stuart Goddard; Cio-Cio-San; Michael Balzary?
10 X; XP; IHS; ICXC; INRI?
11 Lothar Matthäus, (West) Germany; Rafael Marquez and Antonio Carbajal, Mexico?
12 Bridge Farm; Grey Gables hotel; the Bull pub; St Stephen’s church?
13 Jacinda Ardern in June and Benazir Bhutto in 1990?
14 Phobos; Ganymede; Titan; Titania; Triton?
15 Skelton; Belmont; Caldbeck; Emley Moor; Durris?

The answers

1 Charlemagne.
2 Iran.
3 Farting.
4 Halloween.
5 2018 royal wedding.
6 Ned Kelly and co.
7 Project Gutenberg.
8 Candlestick.
9 Insect names: Lady Bird Johnson (US first lady); real name of Adam Ant; Madame Butterfly; bassist Flea (Red Hot Chili Peppers).
10 Christograms (monograms representing Jesus).
11 Footballers who played in five World Cups.
12 Ambridge locations in The Archers.
13 Prime ministers giving birth: New Zealand and Pakistan.
14 Largest moons of: Mars; Jupiter; Saturn; Uranus; Neptune.
15 Tallest structures in the UK (all communications masts/towers).