In Build a Zoo , a conch is treated as an ocean treasure that you can trade to the trash can character near the Sell area for rewards. Players say you need to collect a lot of them before turning them in, so it’s more of a trade-in item than something you use directly in your zoo.

What it does

  • Acts as a collectible ocean treasure.
  • Can be exchanged with the trash can NPC near Sell for items or rewards.
  • It does not appear to be a pet, egg, or upgrade item from the available player info.

Simple example

If you find a conch while playing, you keep collecting more treasures and then bring them to the trash can character near Sell to trade them in.

TL;DR: conches are trade-in treasures, not a zoo-building item, and you hand them in near the Sell area for rewards.