This is likely a _honeycomb_ created by some species of honey bee.
A beekeeper (Jessie Brown) from New Mexico shared to her blog the following photos of a "free form" bee hive some of her bees created:
, the beekeeper moved some "burr comb" to a new location and the bees used that moved remnant piece to build a mound-like comb.
![enter image description here](
Photo credit: Phillip Cairns