Seabirds

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Seabirds have hearts with ________ chambers

Which of the following is the least threatening to sea bird populations

longline (a type of commercial fishing)

rats, cats, and foxes

plastic pollution

human egg hunters

Which of the following feathers are primarily used for flying

downy

powder

round

contour

Common murres will swim to a depth of up to 250 feet in pursuit of schools of small fish.

surface feeder

pursuit divers

Kleptoparasites

plungers

Gannets feed by diving from a great height into the water in order to catch their prey.

surface feeding

pursuit diving

Kleptoparasitism

plunging

Common murres will often nest along steep cliffs.

so that their chicks can have a good place to take off in their first flight

to avoid nest predators

because all of the "good nesting habitat" is taken by other birds

to take advantage of natural caves and burrows in the cliffs

Seabird die offs, like the one reported in the Bering sea in 2019, are not unheard of.

abnormally warm sea surface temperatures

plastic pollution

harmful algae blooms

introduced foxes

Don Croll says of the Aleutian Islands where foxes are introduced species. "The terrestrial ecosystem was being subsidized by marine-derived nutrients, and the foxes basically cut off the subsidies by interrupting the flow of nutrients coming from offshore,

introduced foxes means no seabirds, and no seabirds means fewer nutrients for plants

introduced foxes have less nutrients in their feces than seabirds

islands with introduced foxes have more diverse plant communities

foxes helped the island's plant communities grow with less nutrients

Penguins are

birds, with beaks, claws, and very small wings and small feathers

not birds, they have no wings and no feathers

Seabirds are able to drink salt water thanks to

their high metabolism

salt removal glands just under the eyes

a tolerance they build up starting right after birth

their high blood to body volume

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