EL Karlstein 1956 Bufo boreas March 7 1.3 mi. N, 0.2 mi. W Curi Center Richard, Catia Costa Cr. Calf road, facing pond C north of road, and gradually on way to pond for evening. Toad breeding conditions. At 7:30 P.M. the males seemed to be in the ponds, for none observed on land. Difference in behavior of toads tonight. They were harder to catch as they usually dived for deeper water. The full moon plus warmer temperatures may be responsible. Many toads would be spotted with my head-lamps but quickly disappear or swim off as I was busy working one individual. Russell and I circumscribed Pond A twice, working all toads I could grasp. Of 15 toads (or so) cligged the first round, only one were retrieved the second round and 8-10 new toads were discovered and cligged. Here, any population count based on number of toads in hand can probably be doubled. As working data shows, the adults cluster around vegetation in the ponds but many are out in deeper water (3-4 feet) and often in open water. Lower at egg site #1, Pond A, have reached stage #20 (Pollster & More) but oxygen attatched to edges of the outer jelly envelopes. Envelopes are opaque, algae covered. Mortality of eggs (based on examination of 2 feet of strings) is probably in excess of 50% at this time. However, this is not a close done at night.