Mini Hearth XL (Bone 4007) formicaria What does this mean

What does this mean

have been the number one choice for all of the Pogonomyrmex occidentalis colonies we have raised

Growth Rate: Average

Medium/Large Species Design

4x4 nest (100mm x 100mm)

Mini Hearth XL (Bone 4007) formicaria What does this meanReady for Immediate Shipping, this Mini Hearth XL comes as shown in the photo on this page. ***Modular Design (for more information click this (link)*** Nestmates this Mini Hearth XL comes with two free nestmates ($10 value) (See photo). For more information on this feature, watch this video XL 30% larger formicarium than standard Mini Hearth Foraging Area Dcor (as seen in photo) Museum Glass optional ($5 for holiday sales) Included with this purchase