TL;DR: A study on body temperature regulation and metabolic rate of one species, the Puerto Rican Tody (Todus mexicanus), finds that at low Ta's, Tb of some individuals decreased by as much as 10–11°C during nocturnal hypothermia; these birds remained active and alert, indic...
Abstract: The extremely small size (5–7 g) of todies, together with their taxonomic affinities (Order Coraciiformes) and tropical distribution, suggest that the thermoregulatory physiology of these birds merits detailed investigation. Here, we present results of a study on body temperature regulation and metabolic rate of one species, the Puerto Rican Tody (Todus mexicanus). Basal metabolic rate (BMR) was 3.24 ± 0.59 mL O2·g−1·h−1 (mean ± 1 sd), ∼33% higher than predicted on the basis of mass, but within the range of BMRs reported for other small birds. However, many other aspects of the tody's thermoregulatory physiology are unusual. (1) Average active-phase body temperature (Tb) was 36.7 ± 1.2°C, well below the avian norm of 40–41°C. (2) Todies exhibited heterothermy; over a range of ambient temperatures (Ta) from 15° to 40°C, body temperatures varied from 27.9° to 42.9°C. At low Ta's, Tb of some individuals decreased by as much as 10–11°C during nocturnal hypothermia; these birds remained active and alert, indic...
TL;DR: It is suggested that molecular divergences appear far too low to be consistent with mid-Eocene fossils attributed to the Brachypteraciidae family, the ground rollers.
Abstract: We studied relationships of five extant members of the endemic Malagasy family Brachypteraciidae, the ground rollers, using several mitochondrial genes (cytochrome-b, NADH dehydrogenase 2, 12S ribosomal RNA, and cytochrome oxidase I). As outgroups, we used other coraciiforms including the Cuckoo Roller (Family Leptosomatidae, Leptosomus discolor), several true rollers (Corcaciidae) and a tody (Todidae). Partial sequences of the Long-tailed Ground Roller (Uratelornis chimaera) were obtained from toe pad samples taken off museum specimens. For a combined data set of all genes, Kimura two-parameter distances between sequences of the five ground roller species were high, averaging 11% divergence. For several species, samples were available from widely separated geographic regions and intraspecific sequence divergence was low (≤0.8%). Unweighted and weighted parsimony and maximum-likelihood analyses consistently recovered monophyly of the family, a sister relationship between Brachypteraciidae and Cor...
TL;DR: The senior author and his wife established residence within the forest at an elevation of 770 m, and began intensive studies of the Puerto Rican Parrot (Amazona vittata) and the Puerto Rico Tody (Todus mexicanus), which included a series of census routes through the forest to assess easonal and altitudinal distribution of these and other species.
Abstract: THE West Indies are among the best known of the world's tropical regions, and our knowledge of the distribution of indigenous land birds in the Greater Antilles has been thought to be nearly complete (Bond, 1956). The last new species from the Antilles were described in 19'27, the results of work in the Zapata Swamp of Cuba (Barbour and Peters, 1927) and the isolated Morne de la Selle in Haiti (Wetmore, 1927). No new species has been found in Puerto Rico in this century, and it would seem unlikely that a bird could escape detection on the island, which has a human population density now approaching 320 per square km, and less than 3,300 ha (0.4 percent of land area) of virgin forest remaining (Wadsworth, 1949). Nevertheless the discovery of extant populations of the Puerto Rican Whip-poor-will (Caprimulgus no.ctitherus) by Reynard (1962) and the Puerto Rican Plain Pigeon (Columba inornata wetmorel) by Leopold (1963), both previously presumed extinct (Bond, 1956, 1961), indicated that the inventory of the Puerto Rican avifauna might be incomplete. The largest remaining forest in Puerto Rico is in the Sierra de Luquillo at the island's eastern end. In September 1968 the senior author and his wife established residence within the forest at an elevation of 770 m, and began intensive studies of the Puerto Rican Parrot (Amazona vittata) and the Puerto Rican Tody (Todus mexicanus). These studies included a series of census routes through the forest to assess easonal and altitudinal distribution a d abundance of these and other species (Kepler and Kepler, 1970). Two census routes were established in Elfin Woodland (Figure 1), a distinctive forest type confined to the higher peaks and ridges. In this forest they occasionally noticed a warbler of peculiar appearance, but were unsure of its identity because of the difficulty of seeing small birds in this habitat. The bird (see Frontispiece) showed similarities both to the Blackand-white Warbler (Mniotilta varia), a common North American migrant to Puerto Rico, and the Arrow-headed Warbler (Den•oica pharetra), a