Pati ducks are recently registered indigenous non-descript duck variety of Assam mainly used for meat, egg and ritual sacrifices. In the present study, some important phenotypic morphometric traits were studied under field conditions. Morphometric measurement both Drake Ducks recorded plumage colour patterns all body parts noted by visual observation. The mean length (cm) Body, Shank, Bill, Nec...

Sensory exploitation occurs when signals trigger behavioral reactions that diminish the receiver's fitness. Research in this area focuses on the match between the signal's form and the receiver's sensitivity, but the effect of habitat on interspecific sensory exploitation is rarely addressed. Myioborus redstarts use conspicuous wing and tail displays of contrasting black-and-white plumage patch...

Evidence suggests that animal patterns (motifs) function in camouflage. Irregular mottled patterns can facilitate concealment when stationary in cluttered habitats, whereas regular patterns typically prevent capture during movement in open habitats. Bird plumage patterns have predominantly converged on just four types-mottled (irregular), scales, bars and spots (regular)-and habitat could be dr...

Colour polymorphism results from the expression of multiallelic genes generating phenotypes with very distinctive colourations. Most colour polymorphisms are due to differences in the type or amount of melanins present in each morph, which also differ in several behavioural, morphometric and physiological attributes. Melanin-based colour morphs could also differ in the levels of glutathione (GS...

To develop a suitable duck variety for egg type, one pilot study was undertaken to know the cross performance of Kuzi ducks with exotic breeds available in India. In present study, comparative and its two crosses Khaki Campbell viz × (DK) (KD) were carried out respect juvenile growth, conformation, body colour carcass quality. It observed that significant differences exist between different gen...

Conspicuous ornamentation has been linked to immunological and physiological condition in males of many species. In species where both sexes are ornamented, it is unclear whether the signal content of ornaments differs between males and females. We examined the immunological and physiological correlates of carotenoid-based bill and plumage ornamentation in American goldfinches Spinus tristis, a...

The genus Sphenopsis P. L. Sclater, 1861, has recently been restored to recognise the genetic monophyly of four Neotropical tanager species, formerly placed in Hemispingus Cabanis, 1851, which are little known and poorly represented museum collections: Oleaginous frontalis (von Tschudi, 1844), Black-eared S. melanotis (P. 1855), Western ochracea Berlepsch & Taczanowski, 1884) Piura piurae (Chap...