Take the challenge...
Though hollow, bird’s legs can carry a load
Birds are able to fly due to their hollow, lightweight bones, but how can hollow bones support the weight of the birds when they stand?
Roll a sheet of typing paper lengthwise until it forms a tube approximately 1 inch in diameter and 11 inches tall. Tape the edges of the paper tube to keep it from unrolling. Repeat this step two more times so you have three “bones” in all.
Stand the tubes on end and then balance a paper plate on top. It may help to tape the tubes to the plate.
Add pennies to the plate one at a time to see how many pennies the structure can hold. Distribute the pennies evenly around the center of the plate to keep the structure balanced. This will represent the weight of the bird. Try this experiment using tubes of various lengths and thicknesses to see how much weight the hollow leg “bones” can take.
Take a look back to 2015...
Not all the species that call the Sacramento-San Joaquin Delta home regularly live there. The Delta offers a rich and productive habitat for more than 500 species of wildlife including plants, fish, birds, amphibians, invertebrates, mammals and reptiles. The Delta’s unique ecosystem supports 20 endangered species, from the San Joaquin Kit Fox and the Delta Smelt to the Palmate-bracted bird’s-beak, and serves as a vital migration path for salmon traveling between their home streams and the Pacific Ocean. nearly half of the birds that migrate through california, including the Sandhill crane from distant Siberia, pass through the Delta, which is also a stop-over ground to numerous species of fish and wildlife.
Swainson’s Hawks can be seen soaring on narrow wings or perching on fences. These elegant predators hunt rodents in flight and even run after insects on the ground. Most Swainson’s Hawks are light-bellied birds with a dark or reddish- brown chest and brown or gray upper-parts. They have distinctive under wings with white wing linings that contrast strongly with blackish flight feathers.
For more information on the Swainson's Hawk go to this website: