The most common type of structural trap is formed by an anticline, a structure with a concave (as viewed from below) roof caused by the local deformation of the reservoir rock and the impermeable cap rock. In this case, the intersection of the oil-water contact with the cap rock determines the edges of the reservoir.
Wild Gerbils. Gerbils are small rodents but they are not rats! They normally have white bellies and are agouti coloured. They live in the wild in Central Asia, India, the Middle East, and Africa. They roam the savanna, steppe, hot desert and semi-desert areas of these nations.
Up to two gerbils can be housed together in a 10 gallon aquarium; however, a larger cage is preferred if possible. Optimal temperature range for gerbils is between 65Â° and 85Â° F and the optimal humidity range is between 30% and 50%. Twelve hour light cycles are preferred, with gerbils being active both day and night.