Bugs or Ants?

Been having lots of troubles with what I believe might be the Giant Ants. They have been attacking the plants at night time and really creating havoc.

Our Lemon/Lime tree that was in full bloom and ready to have LOTS & LOTS of lemons has only 3 little lemon buds left 😂

Same with the Bougainville plants. They werr doing excellent and suddenly I woke up to very sorry looking Bougainville plant.