What determines whether a bird species, normally transient, by nature, say canada geese or seagulls, will decide to stay in the north instead of flying south. Simply an adaquate food supply doesn't seem to address the issue completely. Some seem to be staying generationally while others of the same species do in fact fly to wintering grounds.
2006-12-05 08:44:09 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Zoology
Seagulls are not necessarily migratory but in the midwest farm land they are far from the sea and even large lake masses and seem to stay instead of returning to water.
2006-12-05 08:46:35 · update #1
As stated, food source, and warm weather.
Open water sources are another strong determinant. In areas that have permanent open water, such as around power plants, there are often permanent waterfowl residents, even when the species is normally migratory.
2006-12-05 09:38:21 · answer #1 · answered by Anonymous · 1⤊ 0⤋
some stay due to warmer weather also...and what you said an readily available food source.
2006-12-05 17:12:36 · answer #2 · answered by eva diane 4 · 0⤊ 0⤋