The Yellow-vented Bulbul’s (Pycnonotus goiavier) was 5 days old on 8th June 2015. The feeding behavior of the adults was video recorded from 1410-1930 hours from the bedroom. The clips were subsequently analysed to determine the regularity of the visits and the length of time spent inside the nest by each adult on their visits.
As with the 2 days old chick LINK, the adults arrived by two routes. Flying from the garden towards the nesting tree, it would make a sudden u-turn to enter the nest from the left – viewing from the bedroom window. Alternately, the adult may fly directly to enter the nest from the right.
The usual time spent was 10-20 seconds, just to pass on the insects. Entering the nest from the right involved perching on a branch to feed the chick. Using the other route, the adult would perch on the edge of the nest to feed the chick. Only via this route would it actually enter the nest after feeding the chick – and remain there for some time, the longest period being 18 minutes.
As in the case of the 2 days old chick, the adults were not seen removing and disposing any faecal sacs after the feeding – see HERE. Bulbul chicks dispose of their wastes packaged in gelatinous sacs. The ejection of these sacs was not seen due to the foliage around the nest. It is assumed that the adults must have eaten them. After all, at 5 days, the chick’s digestive system most probably was not fully functional as to extract all the nutrients from the food fed to it.
At 5 days old, this chick was fed 16.1 times per hour, based on the number of feeding by the two adults during the monitoring period of about five hours. This compares to the mean of 5.6 feeding per hour in the case of the 2 days old chick. Obviously the younger chick needed less food, thus the adults did not have to work too hard to feed them.
The last feed came towards dusk after which the adult settled in the nest for the night.