§ Comparison

Atlantic puffin or Arctic tern.

Weight

0.31–0.55 kgaudubon.org

0.086–0.127 kgen.wikipedia.org

Length

0.25–0.33 maudubon.org

0.33–0.36 men.wikipedia.org

Lifespan

37 yearsbtoringing.blogspot.com

15–34 yearsnwf.org

Sexual maturity

3–6 yearsbirdsoftheworld.org

3–4 yearsbinocularbase.com

Parental care

1.1–1.6 monthsen.wikipedia.org

1.6–3 monthsnwf.org

Young per litter

1–2audubon.org

1–3en.wikipedia.org

Clutches per year

1en.wikipedia.org

1en.wikipedia.org

Population

12,000,000–14,000,000 individualsworldwideen.wikipedia.org

3,000,000 individualsaudubon.org

Habitat

Lives in the seaen.wikipedia.org

Lives in the seaen.wikipedia.org

Activity

Comes out at dawn and dusken.wikipedia.org

Moves by dayen.wikipedia.org

Diet

Eats fishaudubon.org

Eats fishpmc.ncbi.nlm.nih.gov

Social life

Lives in a colonyen.wikipedia.org

Lives in a colonyen.wikipedia.org

Mating

Forms a lasting pairen.wikipedia.org

Forms a lasting pairen.wikipedia.org

Body covering

Has feathersen.wikipedia.org

Has feathersen.wikipedia.org

Pattern

Is dark above and pale belowrspb.org.uk

Is a single colouren.wikipedia.org

Shelter

Shelters in burrowsen.wikipedia.org

Builds a nesten.wikipedia.org

Territoriality

Only defends the nesten.wikipedia.org

Only defends the nesten.wikipedia.org

Body temperature

Makes its own heaten.wikipedia.org

Makes its own heatcoolantarctica.com

At birth

Is born with open eyes but stays puten.wikipedia.org

Is born with open eyes but stays putbinocularbase.com