Precocial Birds

(redirected from precocial)
Also found in: Dictionary, Thesaurus, Medical, Wikipedia.

Precocial Birds

 

(also, nidifugous birds or praecoces), birds whose eyes and aural openings are already open at hatching or soon thereafter and whose down covering is well developed. Precocial birds are adapted to moving independently (walking or running), and thermoregulation is established early in them. Many can search for food indepenently. Precocial birds constitute one of the basic subdivisions of the bird family by virtue of their postembryonic development. The behavior of the young of precocial birds varies. In large-footed chickens, for example, the young can flutter about immediately and are completely independent of their parents at the time of hatching. The young of ducks and cranes feed independently but stay with their parents. In certain chickens, the young follow their parents, who show them food. Among the rails and sheldrakes the parents feed the young. An example of partially precocial birds is the gull. Young gulls appear with open eyes and are well feathered, but for a certain period of time they remain in the nest and the parents feed them.

G. P. DEMENT’EV

Mentioned in ?
References in periodicals archive ?
Mesmo sob o aparente paradoxo para uma ave considerada precocial, a avestruz possui um dos menores ovos em relacao ao tamanho do corpo, o que possivelmente poderia explicar a alta taxa de mortalidade infantil nesta especie (DEEMING & AR, 1999).
Queste varianti altricial (meno specializzate) o precocial (piU specializzate) sono causate, soprattutto, da differenze nelle riserve endogene di cibo (ad esempio, il tuorlo) nelle prime fasi di sviluppo e rappresentano una risposta all'ambiente mutevole.
Lacking parental care, the chick needs to be precocial, independent and resourceful and it inherits some unusual behaviours for surviving in the rainforest.
One such category comprises species that are relatively large, eat abundant food such as grass, form large herds, and have precocial young that follow the mother from birth and therefore are visible to predators.
Prehatching and hatching behaviors in birds: A comparative study of altricial and precocial species.
Although marsupials are relatively uniform in their degree of development at birth and the group does not exhibit the wide range of altricial and precocial young seen in eutherians, there are differences in the relative level of neonatal maturation (Hughes and Hall 1988).
This variability was not associated with female size at brooding or with the precocial development of penes.
A useful analogy for the reader (from the domain of animal behavior studies) might be the alarm and distress that occur upon the removal of an imprinted object from the environment of an imprinted precocial fowl or other organism, and the distress-reduction that occurs when the imprinted object is reintroduced (see Bateson, 1966; Ratner & Denny, 1964).
Porcupines are born in a precocial state, already possessing incisors, deciduous premolars and the first molars (Taylor, 1935; Jackson, 1961; Sutton, 1972; Woods, 1973).
Social polyandry is used in only 1 % (Oring 1986), respectively less than 5 % of all bird species (Bennett & Owens 2002) and mostly occurs in precocial species of birds (it is most common in waders; e.
By late May the precocial chicks begin to leave the colonies about 2 d after hatching and, accompanied by 1 or both parents, swim rapidly offshore where the chicks are reared (Sealy 1976; Sealy and Campbell 1979; Gaston 1992; Sealy and others 2013).