41. These birds breed in colonies, their eggs being laid directly amongst tree roots or in rock crevices . 42. It is an arboreal species heard calling from shrubs, but can also be found in rock crevices . 43. In the absence of rock crevices or caves, the dens are often built under trees or bushes. 44. Other spoon worms conceal themselves in rock crevices , empty gastropod shells, sand dollar tests and similar places. 45. They live inside rock crevices and canyon walls where humans cannot easily find them, which makes research difficult. 46. The males migrate first, and establish nest sites in strong current areas in rock crevices or on ledges. 47. They are effective diggers, but may sometimes rest in natural cavities such as hollow logs or rock crevices . 48. Sargent's campion ( " Silene sargentii " ) is found in rock crevices to or. 49. "Panulirus longipes " is nocturnal and hides in rock crevices and under boulders during the day. 50. It's a 2-mile hike uphill so we can view water cascading through a narrow rock crevice .
