A comparison of nest defence by Jackdaws, rooks, magpies and crows

1982 ◽  
Vol 11 (1) ◽  
pp. 1-6 ◽  
Author(s):  
A. R�ell ◽  
I. Bossema
Keyword(s):  
Nest Defence

Influence of experimentally elevated testosterone on nest defence in dark-eyed juncos

1998 ◽  
Vol 56 (3) ◽  
pp. 617-621 ◽  
Author(s):  
J.MICHELLE CAWTHORN ◽  
DANA L MORRIS ◽  
ELLEN D KETTERSON ◽  
VAL NOLAN
Keyword(s):  
Nest Defence

scholarly journals Nonvolatile chemicals provide a nest defence mechanism for stingless beesTetragonula carbonaria(Apidae, Meliponini)

Ethology ◽  
2018 ◽  
Vol 124 (9) ◽  
pp. 633-640 ◽  
Author(s):  
Shijie Wang ◽  
Bernadette Wittwer ◽  
Tim A. Heard ◽  
Jason Q. D. Goodger ◽  
Mark A. Elgar
Keyword(s):  
Nest Defence ◽  
Defence Mechanism

scholarly journals Why female birds of prey are larger than males

2020 ◽  
Vol 129 (3) ◽  
pp. 532-542
Author(s):  
Jonny Schoenjahn ◽  
Chris R Pavey ◽  
Gimme H Walter
Keyword(s):  
Sexual Size Dimorphism ◽  
A Priori ◽  
Nest Defence ◽  
Birds Of Prey ◽  
Causal Process ◽  
Size Dimorphism ◽  
Substantial Body ◽  
Key Factor ◽  
Reversed Sexual Size Dimorphism ◽  
Passionate Debate

Abstract The causes of the reversed sexual size dimorphism (RSD; females larger than males) in birds of prey are subject to a centuries-old, passionate debate. A crucial difficulty is to distinguish whether the postulated benefits derive from the proposed causal process(es) or are incidental. After reviewing the existing literature, we present a methodology that overcomes this difficulty and renders unnecessary any speculative a priori distinctions between evolved function and incidental effects. We can thus justify the following novel version of the well-known nest defence hypothesis as the most likely to explain the phenomenon in all birds of prey that show RSD: if the female predominates in actively defending the eggs and young against predators, then she is the heavier sex, and her relatively greater body mass is adaptive. That is, heavier females are favoured (independently of males) by natural selection. The attractiveness of this hypothesis is that it has the potential to explain the phenomenon in all raptors exhibiting RSD, can deal with the exceptional cases in this group, explains the direction of the dimorphism, focuses on a key factor in the reproductive success of most raptors, is parsimonious, i.e. does not require supporting hypotheses, and is supported by a substantial body of evidence.

Methodological problems in studies of avian nest defence

1986 ◽  
Vol 34 (2) ◽  
pp. 561-566 ◽  
Author(s):  
Richard L. Knight ◽  
Stanley A. Temple
Keyword(s):  
Nest Defence ◽  
Methodological Problems ◽  
Avian Nest

Colonial breeding and nest defence in Montagu's harrier ( Circus pygargus)

2001 ◽  
Vol 50 (2) ◽  
pp. 109-115 ◽  
Author(s):  
Beatriz Arroyo ◽  
François Mougeot ◽  
Vincent Bretagnolle
Keyword(s):  
Nest Defence ◽  
Circus Pygargus ◽  
Montagu’S Harrier ◽  
Colonial Breeding ◽  
Montagu's Harrier
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