Some creatures cannot be killed. Instead, they have to be captured with a Net.
The net can be used by going near a catchable creature whilst holding it, such as a Butterfly and pressing C, or clicking the left mouse button.
After capturing a creature, it goes to the Items tab in your Backpack.
Event Creatures[]
These are creatures that may only appear in MilMo during Events.
Birds[]
Butterflies[]
Corrupted Butterfly
Blue Butterfly
Green Butterfly
Medium Pink Butterfly
Dawnwing Butterfly
Pink Butterfly
Red Butterfly
Small Pink Butterfly
Yellow Butterfly