Name The Year: Erle Stanley Gardner, writer, created Perry Mason, born.?

Questions

The cells which make up the antlers of a ----------?

Pigeons and hummingbirds have tiny magnetic particles in their heads that respond to the Earth's magnetic fields and are used for ----------?

In Russia, dogs have been trained to sniff out ore deposits that contain ----------?

The word "struthious" refers to something that resembles or is related to ----------?

The leech will gorge itself up to ---------- its body weight and then just fall off its victim.?