In Lego Batman: Legacy of the Dark Knight, the sloths are located in East End – Amusement Mile; find all sloths in the marked area and attach tracking chips from behind to complete the mission.
Some Slow Bros details
How to Find and Complete Some Slow Bros
Step 1: Travel to East End – Amusement Mile
Open your map and navigate to East End – Amusement Mile in southern Gotham.

This area is accessible via SubWayne Station #9, located underneath the bridge in the center of the zone. The mission marker will appear as a yellow-highlighted zone on your map once you’re in the correct area.

Step 2: Locate the Sloths
Once in East End – Amusement Mile, look for the yellow mission marker on your minimap.

The sloths are scattered within this marked zone. Unlike other escaped zoo animals that may be aggressive or fast, sloths hang around slowly and don’t move quickly.
Step 3: Attach Tracking Chips
Approach each sloth from behind and press the interaction button to attach a tracking chip.

The sloths are tame and will not attack or flee, making this one of the easiest escaped zoo animal missions to complete.

Then grapple up.

And find the second sloth.

The third sloth is on a nearby building too.

Then grapple further up.

And attach a tracker on the fourth sloth.

Now grapple across.

And grapple up.

And attach tracker on the final sloth.

Step 4: Complete the Mission
Once you’ve attached trackers to all sloths in the zone, the mission automatically completes and you receive 2 WayneTech Chips as your reward.

This is the final escaped zoo animal (#21) in LEGO Batman: Legacy of the Dark Knight. After completing this, you’ll have found all 21 escaped zoo animals across Gotham.