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Les periodes d’activite des animaux difficilement observables des forets primaires sont peu connues. Des cameras pieges ont ete utilisees pour etablir les periodes d’activite de quelques mammiferes au Parc national de Tai. Ces cameras non appâtees ont ete installees d’octobre 2016 a aout 2017. L’enregistrement de l’heure et la date de chaque observation a permis de determiner des activites nocturnes, diurnes et cathemerales (actif le jour et la nuit) des especes a travers le pourcentage des videos obtenues. Les heures d’activite pour chaque espece etaient concentrees autour du vecteur moyen (heure moyenne autour de laquelle sont concentrees les heures d’activite de l’espece) et reparties de maniere non-uniforme pendant la periode de 24h. Les mammiferes de petite masse corporelle ( 10 kg) avaient des tendances nocturnes, diurnes ou cathemerales. Certaines especes cathemerales ont montre des periodes d’activite a predominance diurne ou nocturne et doivent faire l’objet d’etudes supplementaires enfin de connaitre les facteurs influencant leur regime d’activite.Mots cles : camera piege, taux de capture, mammiferes, vecteur moyen.   English Title: Activity periods of some terrestrial mammals by using camera traps in Tai National ParkDetermination of cryptic animal’s activity periods is problematic in primary forests and reminds poorly known. Hence, in the Tai National Park, camera traps were used to establish the periods of activity of some mammals. These non-baited cameras were installed in the research area of the park from October 2016 to August 2017. Recording the time and date of each observation enabled to determine nocturnal, diurnal and cathemeral activities of each species through the percentage of videos obtained. Hours of activity for each species were concentrated around the mean vector and were not uniformly distributed over the 24-hour period. Furthermore, mammals with smaller body mass ( 10 kg) had nocturnal, diurnal or cathemeral tendencies. Certain cathemeral species have predominantly shown day or night periods of activity and must be subject to further studies to find out more about the factors influencing their regimes of activity.Keywords: camera trap, detection rate, mammals, mean vector.

Détermination par caméra piège des périodes d’activité de quelques mammifères terrestres au Parc National de Taï