Snail Kite (Rostrhamus sociabilis) Science Article 2 abstract Kleptoparasitism is defined as the stealing of food from an individual by another individual (Rothschild and Clay 1952). Interspecific kleptoparasitism occurs in many animal groups but is particularly widespread among birds, especially when individuals of different species regularly congregate at feeding areas (Brockmana nd Barnard 1979). BRUCE […]
HUNTING BEHAVIOR, PREY SELECTION, AND ENERGETICS OF SNAIL KITES IN GUYANA: CONSUMER CHOICE BY A SPECIALIST
Snail Kite (Rostrhamus sociabilis) Science Article 5 abstract The hunting behavior, snail size selection, and time-activity patterns of non-breeding Snail Kites (Rostrhamus sociabilis sociabilis) were studied in Guyana rice fields. Kites spent 62% of the photoperiod perching, 19% foraging, 13% in maintenance activities, and 6% flying. As the day progressed, the percentage of daylight hours […]
Smooth-billed Ani (Crotophaga ani L.), a New Species of Bird for Ohio
Smooth-billed Ani (Crotophaga ani) Science Article 2 abstract A smooth-billed ani (Crotophaga ani L.) is reported from Ohio for the first time. The specimen(CMNH 68471) also represents the first inland state record for the United States. Confirmation of specificidentity was obtained because of the significance of the record and some equivocal characteristics of thespecimen. Care […]
Ani Male Apparently Killed by Other Anis while Attempting to Parasitize Nest
Smooth-billed Ani (Crotophaga ani) Science Article 1 abstract On 11 April 1981 I collected a dead male Smoothbilled Ani (Crotophagan i) under the nest tree of an ani group on Virginia Key, Dade County, Florida. The color-banded male was apparently killed by a anis while he and his mate attempted to parasitize their nest. ROBERT […]
Photos of Micrastur species in Peru, covering the Surinam species
Slaty-backed Forest Falcon (Micrastur mirandollei) Science Article 1 abstract Five of the seven species of the mysterious Forest-falcons (Micrastur: Falconidae) occur en Los Amigos river basin, Madre de Dios, Peru Ursula Valdez, Boletin SAO Vol. XVI (No. 02) – Dic. 2006 Download article download full text (pdf)
The Slate-colored Seedeater (Sporophila schistacea): a bamboo specialist?
Slate-coloured Seedeater (Sporophila schistacea) Science Article 1 abstract The idea of constant density and stable territoriality found in some tropical birds (Greenberg & Gradwohl1986) does not lend itse1f to species that rely on a short-term, unpredictable resource. One such resource is mast-seeding plants. Mast seeding is the synchronized production of seed at long intervals by […]
Nesting behavior of the Slate-colored Seedeater (Sporophila schistacea) in Panama
Slate-coloured Seedeater (Sporophila schistacea) Science Article 2 abstract The nesting behavior of the Slate-colored Seedeater (Sporophila schistacea) is virtually unknown, and few nests have been described previously (Wetmore et al. 1984, Hilty & Brown 1986). This species is highly nomadic and tends to breed I in areas with large seed crops, particularly bamboo (Willis & […]
Sustainable Arable Farming For an Improved Environment (SAFFIE): managing winter wheat sward structure for Skylarks Alauda arvensis
Sky Lark (Alauda arvensis) Science Article 5 abstract Research has shown a close correlation between the decline of the UK Skylark Alauda arvensis population and the replacement of spring-sown cereals with winter-sown varieties, in which advanced sward development prevents successful multiple nesting attempts and reduces access for foraging. Widescale reversal of sowing times is unlikely […]
Abundance of Four Lark Species in Relationto Portuguese Farming Systems
Sky Lark (Alauda arvensis) Science Article 2 abstract Throughout much of Europe, farmland birds have declined more than those of other habitats, because of the abandonment of traditional farming systems and the simplification of remaining agricultural systems, including increased use of external inputs (Tucker & Heath 1994, Baldock 1991, Bignal & McCracken 1996). Traditional low-input […]
Seasonal and interannual variability in laying date, clutch size, egg volume and hatching asynchrony of four lark species in Mediterranean Spain
Sky Lark (Alauda arvensis) Science Article 6 abstract To describe the variation in laying date, clutch size, egg volume and hatching asynchrony of four lark species (Skylark Alauda arvensis, Short-toed Lark Calandrella brachydactyla, Thekla Lark Galerida theklae and Lesser Short-toed Lark Calandrella rufescens) and at two different time scales: between years (large-scale variation), and within […]