Bug collecting

Bug Catching was first introduced in The Sims 2: Seasons, allowing Sims to catch butterflies and fireflies. The Sims 2: FreeTime allows Sims to catch bugs and add them to a collection. In The Sims Castaway Stories and the DS version, it is possible to gather bugs, which can be eaten, traded, or kept and collected. The Sims 3 also features collecting butterflies and beetles. The Sims 3: Into the Future features robotic bugs called nanites.

Bug Catching
Butterflies may appear during the day and fireflies may appear in the evening. A Sim can try to catch a butterfly or firefly in a jar, though it may take several tries before they succeed. This is usually initiated by the player clicking on the tile where the butterflies or fireflies appear, though Sims may also do it autonomously. Once butterflies or fireflies are caught, Sims can view them inside the jar or release them. If they are left in the jar, they will eventually die, though this can be avoided by using a cheat.

A Sim may have wants to catch butterflies or fireflies, but the want will not be fulfilled until the Sim actually catches one.

With FreeTime, trying to catch butterflies or fireflies will build Nature enthusiasm, as will viewing captured ones. Also, Sims who catch butterflies might occasionally put them in their bug collection.

Toddlers can chase butterflies or fireflies, but cannot catch them. With Freetime, they gain Nature enthusiasm from doing this.

Bug Hunting
There are three types of bugs a Sim can catch: Beetles, Butterflies and Spiders. To have a Sim catch bugs, click on outdoor terrain and select "Hunt Bugs". Sims will continue this action indefinitely but will not always catch anything. Once a Sim catches a bug it will be placed in their collection box, which can be found in their inventory. Players can view the collection by placing it on the lot and selecting "View". When Sims go hiking, they might catch a bug. If they already have that bug in the collection, they'll release it. A Sim must have at least level 8 enthusiasm in the Nature hobby to be able to collect all of the bugs.

A Sim with Nature enthusiasm may have a want to hunt bugs, but the want will not be fulfilled until the Sim actually catches a bug.

If a Sim hunts bugs for very long, it will have a strong effect on his or her hygiene. If a PlantSim hunts bugs, it will affect his or her water motive. Occasionally, a Sim who is hunting bugs will be chased by bees.

Collections

 * Notes
 * There is a bug that prevents Sims from finishing the bug collection. This was fixed in the FreeTime patch, but broken again in Apartment Life. This mod fixes the bug.

The Sims 3
Butterflies, beetles, and nanites are also collectible in The Sims 3.

Butterflies

 * Notes
 * Since Patch 31, butterflies will no longer spawn at night, and they will be replaced with fireflies.
 * There is a glitch with the Firefly Collector challenge, in which the challenge could not be completed even if a Sim has caught all 8 types of fireflies. This is due to the fact that the Firefly Collector challenge is a duplicate of the Butterfly Collector challenge, which requires 10 types of butterflies to complete.
 * There is a glitch with the Firefly Collector challenge, in which the challenge could not be completed even if a Sim has caught all 8 types of fireflies. This is due to the fact that the Firefly Collector challenge is a duplicate of the Butterfly Collector challenge, which requires 10 types of butterflies to complete.

Beetles

 * Notes
 * Plasma Bugs are a reference to the giant, plasma-shooting alien insects of the Starship Troopers movie.

Nanites
Nanites are robotic bugs featured in The Sims 3: Into the Future. They can be found in Oasis Landing. Nanites are essential components of some, but not all, trait chips, and some advanced chips require specific nanites

Unlike butterflies and beetles, Sims can design and create nanites; doing this requires Reventlov's Bot Workshop. Designing and creating a nanite increases the Bot Building skill. Nanites can also be reverse engineered. Reverse engineering a nanite lets a Sim learn how to design it, and may yield empty processors.