The Victorian naturalist . ly nestedon the fresh water lagoon and alongHanns Inlet usually between Augustand October. Cygnets were seen onnumerous occasions. On 15th Septem-ber, 1962, a Swamp Harrier was seento harass a pair with seven cygnetsapproximately two weeks old. Hefinally succeeded in taking one. (b) Coolart Lagoon. The species gradually built up innumbers as the survey progressed,reaching over 300 by May 1966. It ap-peared the lagoon was a haven for non-breeding birds as the largest countswere invariably recorded during thebreeding season (refer Figure 2). Atleast six pairs nested ea
The Victorian naturalist . ly nestedon the fresh water lagoon and alongHanns Inlet usually between Augustand October. Cygnets were seen onnumerous occasions. On 15th Septem-ber, 1962, a Swamp Harrier was seento harass a pair with seven cygnetsapproximately two weeks old. Hefinally succeeded in taking one. (b) Coolart Lagoon. The species gradually built up innumbers as the survey progressed,reaching over 300 by May 1966. It ap-peared the lagoon was a haven for non-breeding birds as the largest countswere invariably recorded during thebreeding season (refer Figure 2). Atleast six pairs nested each year fromAugust to November. The swans werealways the first species to commencebreeding and were consistently success-ful with large clutches. Mortality ap-peared minimal and there was no evi-dence of double brooding, , 2, 3A, 5and 8. 37a. Tadorna tadornoides. Chestnut-breasted contrast to the preceding species, areverse pattern was evident. A mostregular situation existed at Coolart 60 Vict. Nat. Vol. 92. FIGURE 2. Black Swan. Average count per season, Naval Base Mud Flats . Coolart Lagoon. HASTINGS COLAC PLAY GROUNDS COLAC SQUARE Period Adult Immature Total Adult Immature Total Adult Immature Total Dec. to ., ,Aug. 28 6 34 41 13 54 48 7 55 Sept. to . WfiY. 14 14 28 43 5 48 32 1 33 TABLE 1. Silver Gull. Group comparisons - average for 3 feeding groups . April, 1975 61 where as at the tidal flats it was com-pletely random. The species was notedon the flats in pairs only duringFebruary, March, July and 1964 saw an irruption when over200 were seen in a tight flock. A weeklater approximately 300 were notedalong the Somers seashore (probablythe same flock). There were no recordsoutside these four months. At Coolart the species was com-pletely absent from June to pairs were recorded from Octo-ber to early February. Mid-Februarysaw a sudden influx to a peak of 60 to80, the birds staying until May when aquite sudden dispersion took pl
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