Tundra Swan
- eNature tells what they look like, where they live, why they are not endangered, and what they eat. Hear a recording of their call.
- http://www.enature.com/fieldguides/detail.asp?allSpecies=&searchText=swans&GroupID=&curGroupID=1&lgfromWhere=&curPageNum=2

Trumpeter Swan
- Explains why this largest swan is endangered in Ohio, what it looks like, how it got its name, and where it lives in North America.
- http://www.dnr.state.oh.us/wildlife/PDF/pub381.pdf

Mute Swan
- Read about where they live and nest in the UK, see them build a nest, hear their call and why they are threatened. [Audio/video requires free Quicktime download.]
- http://www.rspb.org.uk/birds/guide/m/muteswan/index.asp

Bewick's Swan
- Learn this bird's different names, where it lives, why it is threatened and what it eats. See them swimming and hear their call. [Audio/video requires free Quicktime download.]
- http://www.rspb.org.uk/birds/guide/b/bewicksswan/index.asp

Whooper Swan
- Hear what sounds they make, learn why they are threatened, where they nest and when they migrate to the UK. [Audio/video requires free Quicktime download.]
- http://www.rspb.org.uk/birds/guide/w/whooperswan/index.asp

Black Swan
- Learn about the appearance, diet, behavior, habitat, and range of the black swan.
- http://www.scz.org/animals/s/bswan.html