José Luis Tella

TL;DR: Results from PHA skin tests conducted on 608 birds in seven studies representing passerines, waterfowl, upland game birds and raptors are examined and the only disadvantage identified is that hypersensitive individuals (outliers) could be missed.

TL;DR: It is shown that the magnitude of the adrenocortical response to a standardized perturbation during development is negatively related to survival and recruitment in a wild population of long lived birds, providing empirical evidence for a link between stress response, not exposure to stressors, and fitness in a vertebrate under natural conditions.

TL;DR: A direct, nonlinear relationship between food intake, body mass, and CMI is identified in captive yellow-legged gulls, suggesting that birds may reach a threshold above which increases in food intake and body mass do not enhance CMI.

TL;DR: Urban invaders do not appear to be individuals from apparently tame species, but rather tame individuals from species with a variable response regarding fear of people, suggesting that behavioural flexibility should be regarded as a specific trait encompassing variability among individuals.

TL;DR: Neither chick CMI nor adult CMI was related to clutch size, contradicting previous results linking parasite–related mortality to CMI and the evolution of clutch size (reproductive investment) in birds.