The most frequent endoparasite of the Maned wolf - Chrysocyon brachyurus (Illiger, 1815) is the giant kidney-worm. Dioctophyma renale (Goeze, 1782). It has heen responsible for the majority of deaths of captive animals. Twenty-six marked wolves have been followed in the field with ear-tags and radio-collar tagged (Tab. II) to investigate their interactions with the environment, their diurnal shelters, movements and habits, and their delivery sites. Ten years of life history data have heen gathered. They are territorial and monogamous, and give birth to two or three young once a year, after a 63 days gestation, on average. Maned wolves inhabit the open areas and have omnivorous feeding habits.

Nests of the "Scaly-headed parrot" and "Illiger's macaw" - Pionus maximiliani (Kuhl, 1820) and Ara maracana (Vieillot, 1816) - found at the Ecological Station in Gália, São Paulo with clutches in 26-VII-90 and 20-IX-90, both containing four white rounded and at one end slightly pointed eggs, measuring 33.4x30.0mm and 33.0x28.0mm each respectively, are being reported on. The incubation in the "Scaly-headed parrot" lasted for 26 days, the stay of the young in the nest cavity for about 50 days and only one adult was seen incubating, while in "Illiger's or Blue-winged macaw" both parents used to stay in the nest.

A contribution to the knowledge of the social organization of a population of Golden-rumped or Black-lion tamarin (L. chrysopygus) living in a stripe of natural vegetation in the State Park along the banks of the lower Paranapanema River, in the State of São Paulo, Brazil. Its composition and analysis based on captured groups, number of individuals and their distribuition in the area with concentrations; exchange of adults males, migration of individuals from groups and females home range establishment, indicate an organization which is likely to be matrilinear. The average number of individuals per group or expanded families, in the seven (7) captured groups was 3,57 specimens with a mean body weight in adults of 572,5 grams. In each group there is normally one reproducing couple with a double twin pregnancy in 2/3 (65 to 80%) of the occasions, and the twins are dizygotic. This tends to repetition in multiparous females.