| a comparative study of the forebrain of 4 species of south american birds. | the brains of the swift streptoprocne zonaris, the flycatcher tyrannus melancholicus, the tanager ramphocelus dimidiatus and the finch oryzoborus angolensis were compared with respect to the hyperstriatum accessorium, hyperstriatum dorsale, hyperstriatum ventrale, neostriatum, ectostriatum, paleostriatum augmentatum and paleostriatum primitivum. in each of these brain parts the average number of cells and the average cell size were calculated, and the species were compared with respect to the sa ... | 1978 | 742725 |
| the nucleus mesencephalicus lateralis, pars dorsalis in neotropical passerines. | the volume of the nucleus mesencephalicus lateralis, pars dorsalis and the optic lobe were determined in 8 species of neotropical birds in the order passeriformes: pyrocephalus rubinus, pitangus sulphuratus, atticora fasciata, molothrus bonariensis, tangara nigrocincta, ramphocelus dimidiatus, euphonia xanthogaster and spinus magellanicus. the ratio of the volume of the nucleus to the volume of the optic lobe was calculated for each species, and was found to be larger in all 8 species than in a ... | 1979 | 526853 |
| estimating annual survival in sexually dimorphic species from proportions of first-year birds. | we estimated the annual adult survival (s) of several species of temperate and tropical sexually dimorphic tanagers and manakins from the proportions of first-year and older individuals in museum collections. in the case of the sexually dimorphic species included here, young males through their first year resemble females and can be distinguished from older males. we assumed that the sex ratio among first-year birds is even and estimated the number of immature females (if) in a sample as equal t ... | 2007 | 17601134 |