. Bulletin. Science; Natural history; Natural history. ,S',\ BULLETIN SOUTHERN CALIFORNIA ACADEMY OF SCIENCES VOLUME 73. Figure 2. Photograph of vegetation at breeding pond, with Agalychnis spurrelli and egg masses, Osa Peninsula. Costa Rica, taken on the morning 10 August, 1970. At least 20 A. spurrelli may be found in this picture. in a few old egg masses containing dead eggs, on August 10, 1970. Several frog species in addition to A. spurrelli were calling in or around the pond during some of the August 1970 observation periods (Hyla ebraccata, H. rosenbergi, H. elaeochroa, H. botilengeri.
. Bulletin. Science; Natural history; Natural history. ,S',\ BULLETIN SOUTHERN CALIFORNIA ACADEMY OF SCIENCES VOLUME 73. Figure 2. Photograph of vegetation at breeding pond, with Agalychnis spurrelli and egg masses, Osa Peninsula. Costa Rica, taken on the morning 10 August, 1970. At least 20 A. spurrelli may be found in this picture. in a few old egg masses containing dead eggs, on August 10, 1970. Several frog species in addition to A. spurrelli were calling in or around the pond during some of the August 1970 observation periods (Hyla ebraccata, H. rosenbergi, H. elaeochroa, H. botilengeri. Agalychnis callidryas, and Leptodac- tylus pentadactylus) and the tadpoles of H. ebrac- cata. H. boulengeri, A. spurrelli, and Leptodac- tylus poecilocheilus were seined from the pond. Large tadpoles of either (or both) A. callidryas or A. spurrelli were in the pond in March 1970 and Lynch (Duellman, 1970, p. 127) took tad- poles of A. spurrelli there in early August 1967. Observations of frog activity: On August 9, hard afternoon thundershowers broke a short dry spell of several days and frogs were exceptionally active during the night following the rains. At 0600 on August 10 a low, seemingly distant frog chorus, emanating from the direction of the pond, could be heard from the road. When we reached the pond, the chorus still seemed to be distant but, now, nondirectional. After a moment constant motion drew our attention to the trees overhead. They were literally seething with adult A. spurrelli (Fig. 2). Most of the frogs were moving back into the trees from branches over the pond, but there were many frogs moving opposite to the general trend. Males formed a majority of the frogs, but many females, both free and in amplexus, were present. Occasionally a frog would fall from the trees into the pond. The frogs were concentrated in three areas composing 10 m, 50 m, and 4 m of the pond margin (Fig. 1). Frogs covered the vegetation from the water level to 10 m high, but they wer
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