Mutual Aid · Chapter
Adaptations to Avoid Competition explained
This chapter explores how various animal species avoid competition through diverse adaptations, such as varied diets, flexible behaviors, and sociability.
What happens
This chapter explores how various animal species avoid competition through diverse adaptations, such as varied diets, flexible behaviors, and sociability. Using examples like the hairy armadillo, lapwing, and South American treecreepers, it argues that cooperation and intelligence, rather than strength or weapons, enable species to thrive and occupy wide ranges.
Themes in this chapter
Sociability in Nature
The chapter highlights how sociability and cooperation among treecreepers and other birds enable them to avoid competition and thrive.
Individualism vs. Cooperation
Contrasts the common emphasis on individual weapons and strength with the cooperative strategies that actually lead to success.
Characters to notice
- W. H. Hudson
Provides key examples of the hairy armadillo and South American treecreepers, emphasizing their adaptive strategies and sociability.
- Charles Dixon
Cited for observations on the lapwing's adaptability and the varied diet of birds of prey.
- Henry Walter Bates
Referenced for his description of 'wandering bands' of birds in South America.
- Nikolai Severtsov
Mentioned in connection with ducks as an example of defenceless birds that thrive through sociability.
Key passages
“It has struck a line for itself, and consequently thrives, while its congeners are fast disappearing. Its food is most varied. It preys on all kinds of insects, discovering worms and larvae several inches beneath the surface. It is fond of eggs and fledglings; it feeds on carrion as readily as a vulture; and, failing animal food, it subsists on vegetable diet-clover, and even grains of maize. Therefore, when other animals are starving, the hairy armadillo is always fat and vigorous.”
The hairy armadillo has carved out a unique niche, allowing it to flourish while related species decline. Its highly varied diet—including insects, eggs, carrion, and plants—ensures it remains well-fed even when other animals face scarcity.
Illustrates how dietary flexibility helps avoid competition.
“Some species of Xenops and Magarornis, like woodpeckers, climb vertically on tree-trunks in search of insect prey, but also, like tits, explore the smaller twigs and foliage at the extremity of the branches; so that the whole tree, from the root to its topmost foliage, is hunted over by them.”
Certain treecreepers combine woodpecker-like vertical climbing with tit-like exploration of twigs and leaves, ensuring they cover every part of a tree for food.
Demonstrates behavioral adaptation to maximize resource use without direct competition.
“They are timid, unresisting creatures, without strength or weapons; their movements are less quick and vigorous than those of other kinds, and their flight is exceedingly feeble. But they possess—both Hudson and Asara observe—'the social disposition in an eminent degree,' although 'the social habit is kept down in them by the conditions of a life which makes solitude necessary.'”
Though defenseless and physically weak, these birds are highly social, but their solitary feeding habits limit the expression of that sociability.
Highlights the tension between social tendencies and ecological constraints.