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KMID : 0380319690020000069
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Journal of Korean Research Institute for Better Living
1969 Volume.2 No. 0 p.69 ~ p.81
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BIOLOGY OF GRAY HERON AND EGRETS
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Abstract
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1. Ardea cinerea, Egretta alba modesta, E. garzetta, E. intermedia and Bubulcus ibis are recognized in eleven observed nesting places in Korea.
2. The nests were built mostly on pine trees, but also oak, black alder, Himalaya cedar, camellia, persimmon, and acasia trees.
3. Since ten nests of different species were observed on a single tree, there is no territorial boundary among the egrets.
4. The earliest arrival was March 25th and the last flight to the south was October 6th.
5. Egg laying begins from April 15th and the usual clutch is four eggs. Incubation and growing periods are as follows:
egg sige(mm) incubation(day) growing(day)
A. cinerea 64X43 27 55
E. alba modesta 55X38 26 50
E. intermedia 49X35 25 45
E. garzetta 44X33 23 40
B. ibis 45X34 21 35
6. Food habits
The following animals were confirmed as their food:
earthworm, loach, frog, sea snake, lizard, marine shrimp, beetle, wild rats, and etc.
7. Suggested protection measures are, (1) designate the large nesting places as restricted areas, (2) prevent egg stealing during egg-laying season.
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