Kempenaers said some species are still faithful , notably swans and sea birds such as the albatross , which mate for life and are never unfaithful to their partners .
Kempenaers said fidelity still exists in some species , notably swans and sea birds such as the albatross that mate for life and are never unfaithful to their partners .
Analysts attributed its rise to negative news from bankrupt competitor WorldCom Inc . < WCOEQ.PK > and talk that AT & T could be a takeover target , among other factors .