Background Paragraph: You may hear males "ribbiting," producing a mating call used to attract females to the bodies of water best for mating and breeding. Frog calls can occur during the day or night. Each frog species has a different call that is used to attract mates and warn off rivals. When a female picks a male whose call she likes, the male grabs her and squeezes across her back and around her abdomen. This causes the female to release her eggs. The male then fertilizes the eggs and, in some species, also guards them. 
Story: Bob and Andy were two nature enthusiasts. They went camping together once a month. Bob was into bird watching, while Andy was fascinated with frogs and salamanders. They went on a trip last week-end and they were very happy with what they had observed.
Which friend heard fewer frog calls during the day? Which friend heard fewer frog calls during the night? Which friend heard fewer male frogs producing a mating call? Which friend heard more frog calls during the day? Which friend heard more frog calls during the night? Which friend heard more males producing a mating call? Which friend observed fewer male frogs grabbing female frogs and squeezing them across the back? Which friend observed fewer male frogs grabbing female frogs and squeezing them around the abdomen? Which friend observed more male frogs grabbing female frogs and squeezing them across the back? Which friend observed more male frogs grabbing female frogs and squeezing them around the abdomen?