Which happened earlier: London Zoo opens or Bronx Zoo opens?

Question 1

Which happened earlier?

A London Zoo opens ✓ Earlier

B Bronx Zoo opens

London Zoo opens (27 April 1828) came before Bronx Zoo opens (8 November 1899)

Question 2

Which happened earlier?

A San Diego Zoo opens ✓ Earlier

B Singapore Zoo opens

San Diego Zoo opens (2 October 1916) came before Singapore Zoo opens (27 June 1973)

Question 3

Which happened earlier?

A Chester Zoo opens

B Whipsnade Zoo opens ✓ Earlier

Whipsnade Zoo opens (23 May 1931) came before Chester Zoo opens (10 June 1934)

Earlier #118