Misc: Name either of the only sisters to both win acting Oscars?

Questions

The jackrabbit is not a rabbit; it is a ----------?

The bite of a leech is painless due to its own ----------?

The Jardine River in Australia's Cape York Peninsula is home to Crocodylus porosus, the saltwater or estuarine crocodile. It is the largest and perhaps most dangerous of all ---------- species of crocodilians.?

The black bear is not always black. It can be brown, cinnamon, ----------, and sometimes a bluish color.?

On the Baja coast, osprey couples return to the same nests year after year. These birds rebuild their old nest, carefully repairing any damage caused by winds, rain, and age. After years of rebuilding, some osprey nests can reach heights of ----------?