Misc: arachnoid refers to what kind of creature?

Questions

A ---------- can advance 7 to 8 meters in a single stride, and the animal completes four strides per second. A stride is measured as the distance between successive imprints of the same paw.?

A ---------- will lay bigger and stronger eggs if you change the lighting in such a way as to make them think a day is 28 hours long.?

A cow can't ---------- until she's given birth to a calf.?

A ---------- gives nearly 200,000 glasses of milk in her lifetime.?

A ---------- weighs about 1,400 pounds and eats about 55 pounds of food per day.?