Crabs prefer habitats with softer and wetter edaphic conditions.

"When salt concentrations increase in estuaries, crab populations fall."

When the water temperature starts to fall and the days start getting shorter, the blue crab retreats to deep water and burrows into the muddy or sandy bottom to spend the winter.

Hypoxia, habitat destruction, shoreline development, and chemical toxicants are all thought to be major issues impacting blue crabs and their habitat in Chesapeake Bay.

Crabs are eaten by large fish, some fish-eating birds (like great blue herons), and sea turtles.

the European green crab, the Japanese shore crab, and the Chinese mitten crab are highly effective competitors against blue crabs for prey resources and refuge habitat.

When barrel cactus is exposed to more than six hours of direct sunlight every day, it will develop sunburn.

Glaucous barrel cactus grows best in fertile, gravel-rich, water-permeable soil with a pH value of 6-7.

The optimum temperature for growth is 20 - 35 ℃. Lower than 10 ℃ or higher than 35 ℃, growth slows and dormancy begins.

The air humidity should not be too high and the environment should be well-ventilated.

The Barrel Cactus contains toxic sap that is found in the plant's ribs and can cause skin irritation

Many animals eat the barrel cactus or its fruit, including desert bighorn sheep and antelope ground squirrels.