. Advances in the study of mammalian behavior. Mammals. 412 Spec. Publ. Amer. Soc. Mamm. 7 6 . 2 -. , S Fig. 9. Didelphid vocalizations: "clicks" emitted by a 1-month old Caluromys philander pulled off" the nipple. quency at to kHz and several harmonics modulated during 10 to 100 milliseconds (Fig. 11). This is about the period when the young leave the nipples, and vocalizations have a more or less struc- tured or unstructured pattern according to the degree of excitation of the young (more variable in C. philander). In P. opossum these "clicks"
. Advances in the study of mammalian behavior. Mammals. 412 Spec. Publ. Amer. Soc. Mamm. 7 6 . 2 -. , S Fig. 9. Didelphid vocalizations: "clicks" emitted by a 1-month old Caluromys philander pulled off" the nipple. quency at to kHz and several harmonics modulated during 10 to 100 milliseconds (Fig. 11). This is about the period when the young leave the nipples, and vocalizations have a more or less struc- tured or unstructured pattern according to the degree of excitation of the young (more variable in C. philander). In P. opossum these "clicks" (Fig. 12) progressively disappear when the young release the nipple and the first "hiss"—associated with the typical posture (opened mouth)—is emitted very early in conditions of fear (for example, during manipulation by the expe- rimenter) or at an early stage when it is pulled off the nipple artificially. The hiss develops rapidly towards the adult form although it is initially weak (Fig. 13). Similar observations have been made on a hand-reared D. marsupialis. In C. philander the hiss appears later in comparison to P. opossum (30 days after the young release the nipple) and the clicks. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Eisenberg, John Frederick; Kleiman, Devra G; American Society of Mammalogists. [Shippensburg, Pa?] : American Society of Mammalogists
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Keywords: ., bookcentury1900, bookcollectionbiodiversity, booksubjectmammals
