The invasion of NUMT is not infrequent in birds [ 35- 37] and it had been identified in several goose species [ 36].
There were infrequent wild bird-swine interactions, despite the proximity of a protected avian sanctuary to the Chancay swine farms and the propinquity of the beach in both Tumbes and Chancay.
Previous studies have documented that carriage of Salmonella spp. by apparently healthy migrating birds is infrequent, although some isolates have been recovered (7, 8 ).
This is, to our knowledge, the first study that demonstrates different structural levels within raven nonbreeder aggregations: first, a loose organization composed of local birds, regular visitors and infrequent visitors and, second, the individuals' engagement in consecutive social bonds.
Different activation times of larvae and nymphs along this geoclimatic axis also determine the dissociation between infestations with the 2 stages, as indicated by lack of correlation between their numbers on a given bird, as well as relatively infrequent co-infestations.
Winter flocks had infrequent range access and low number of birds on the range (49 ± 175 chickens outdoor at any one time).
Most human cases have had live poultry or live-bird market (LBM) environmental exposure; person-to-person spread appears infrequent (4 ).
Finally, 73 ravens (55% of the total number of marked birds) were present on fewer than one-third of the days sampled and are called infrequent visitors hereafter.
This phenomenon takes place, for example, among birds of the arid zones of Australia, where ducks, parrakeets, and seedeaters appear in a locality following infrequent and unpredictable rains, breed, and then move to other areas.
I have a handful of bird books I occasionally flip through at home, hoping I'll recognize this warbler or that hawk on my runs through the park, and I used to make infrequent outings to scout birds.
