Category: Africa

Foam produced by maleCcoturnix quail: what is its function?

Quail (Coturnix coturnix) Science Article 2 abstract Males of the Old World quail genus Coturnix are unique among birds in possessing a well-developed proctodeal gland. The gland and associated cloacal musculature are sexually dimorphic, androgen dependent, and produce a foamy substance that is introduced into the female along with semen during copulation, suggesting that the […]

Estimation of total numbers of Pied Avocets Recurvirostra avosetta using a moulting site in the Danish Wadden Sea.

Pied Avocet (Recurvirostra avosetta) Science Article 3 abstract After the breeding season Pied Avocets Recurvirostra avosetta gather at moulting sites. Counts show that some of these sites host large parts of the total population, but it is not known how many individuals use a particular site over a season (volume of a site). Here we […]

The Banc d’Arguin Mauritania as a meeting point for Avocets during spring migration.

Pied Avocet (Recurvirostra avosetta) Science Article 1 abstract About 35% of the W. European population of the Avocet winters south of the Sahara. At least 4% of these birds utilize the Banc d’Arguin as a stopover site for some hours. It is proposed that the area functions as a ‘meeting point’ where Avocets merge into […]

The Banc d’Arguin Mauritania as a meeting point for Avocets during spring migration.

Pied Avocet (Recurvirostra avosetta) Science Article 1 abstract About 35% of the W. European population of the Avocet winters south of the Sahara. At least 4% of these birds utilize the Banc d’Arguin as a stopover site for some hours. It is proposed that the area functions as a ‘meeting point’ where Avocets merge into […]

Intraspecific variation in length of incubation period of Avocets Recurvirostra avosetta.

Pied Avocet (Recurvirostra avosetta) Science Article 2 abstract This paper investigates factors influencing the intraspecific variability of incubation periods in Avocets Recurvirostra avosetta. The length of the incubation period of 278 clutches ranged from 19 to 34 days with an average of 23.1 days. Incubation period was influenced by clutch size. There was a seasonal […]

Intraspecific variation in length of incubation period of Avocets Recurvirostra avosetta.

Pied Avocet (Recurvirostra avosetta) Science Article 2 abstract This paper investigates factors influencing the intraspecific variability of incubation periods in Avocets Recurvirostra avosetta. The length of the incubation period of 278 clutches ranged from 19 to 34 days with an average of 23.1 days. Incubation period was influenced by clutch size. There was a seasonal […]

Estimation of total numbers of Pied Avocets Recurvirostra avosetta using a moulting site in the Danish Wadden Sea.

Pied Avocet (Recurvirostra avosetta) Science Article 3 abstract After the breeding season Pied Avocets Recurvirostra avosetta gather at moulting sites. Counts show that some of these sites host large parts of the total population, but it is not known how many individuals use a particular site over a season (volume of a site). Here we […]

Individual auditory recognition in the least tern (Sterna albifrons)

Little Tern (Sterna antillarum) Science Article 1 abstract Playback experiments performed in a colony of Least Terns near Fort Macon, North Carolina, demonstrated that adults can distinguish the call of their mate from that of a stranger. Sonagram analysis of the ‘Purrit-tit-tit’ call, the most common vocalization used when an adult approaches its mate, revealed […]

Individual auditory recognition in the least tern (Sterna albifrons)

Little Tern (Sterna antillarum) Science Article 1 abstract Playback experiments performed in a colony of Least Terns near Fort Macon, North Carolina, demonstrated that adults can distinguish the call of their mate from that of a stranger. Sonagram analysis of the ‘Purrit-tit-tit’ call, the most common vocalization used when an adult approaches its mate, revealed […]

Primary moult, body mass and moult migration of Little Tern Sterna albifrons in NE Italy

Little Tern (Sterna antillarum) Science Article 3 abstract Large post-breeding gatherings of Little Terns Sterna albifrons are regularly observed in the Lagoon of Venice, Italy. Here, during five consecutive trapping seasons, 2956 birds were examined and ringed. Their breeding area, as indicated by 163 direct recoveries (mainly juveniles, ringed as chicks), spans over a broad […]