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Modal is a Shorea based ecorace of tropical tasar silkworm Antheraea mylitta Drury, exclusively wild, multiplies sou moto in nature, univoltine, almost disease free, produces the heaviest cocoon with highest silk content among all the sericigenous lepidopterans of world and contributes 19% to raw silk production of India. There is a great variation in the genotypes of Modal in the varied ecological conditions of Similpal forest. However tussar silk has been fascinating the human society since time immemorial and it is regarded as �Queen of textiles�. Silk is the most elegant textiles in the world with unparalleled grandeur, natural shine, inherent affinity for dyes and high absorbance. It is of light weight, soft in touch and has high durability besides organic in nature The Demand for it is growing constantly at the present time, However Tussar silk is very much associated with Indian tradition and culture. It always enriches sacredness, religious faith and it promotes the progress of science, technology and economics. So, it is treasured like gold and offered as gift by each and every nation of all over the globe. The sector of sericulture has been emerged to explore more in this field to boost the contribution for mankind. It includes both agriculture and industrial activities. Sericulture involves the raising of food plants for silkworm, silkworm rearing for production of cocoons, reeling and spinning of cocoon for products of yarn, weaving of silk yarn for production of fabric etc. The genus Antheraea is very important from economic point of view since this produce Tasar and Muga silks and has a direct bearing on sustainable resource management and ecosystem development. Tropical tasar silkworm Antheraea mylitta Drury is exploited in country for commercial silk production and improved by means of optimial utilisation of the ecosystem.The Modal unique Ecorace which is found in Similipal Biosphere Reserve (SBR) of Mayurbhanj district. It predominantly feeds on sal producing very high quality of cocoons rich in silk content. However this has a strong impact on the local economy of the immediate community. So there is a urgent need of studying the behavioural pattern of drury in the SBR.Here in this study an attempt has been made in this context.