I found using CO2 to be very effective. Pretty simple. Get a paint/ball gun CO2 canister and adapter. A medium to large size plastic storage container with screw on lid. Drill a suitable sized hole into the bottom side of the container to attach the adapter. Drill a small hole into the top of the container.

Insert rodents. Tighten lid back on. Slowly turn the handle on the canister to release gas. CO2 is heavier than oxygen. As it flows into the bottom of the canister it will push out the oxygen through the hole drilled into the top of the container.

This does not work on pinks. Pinks will need to be frozen. Use caution when filling with gas too quickly as this could blow the lid off the canister.

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