. The Canadian field-naturalist. 1986 LicHT: Food and Feeding Behavior of Frogs 25 â o o o »2 c a> O CL 100 90- 80- 70- 60- 50- 40 â Juvenile-Adult R. aurora (180 items) CS Juvenile-Adult (i9l items) D Newly Metamorphosed R. ouroro (542 items) Q Newly Metamorphosed R. pretioso (116 items ). ^LJ-F 0) D T3 C 0) o o .^ n 3 0) O c 1. 3 E u H K FiRi Ehu < Food Item Figure 2. Comparison of dominant food items of frogs of different age classes, and percentage of total food intake each food item comprises. Top eight items are those most abundant in all stomachs of each age class (see
. The Canadian field-naturalist. 1986 LicHT: Food and Feeding Behavior of Frogs 25 â o o o »2 c a> O CL 100 90- 80- 70- 60- 50- 40 â Juvenile-Adult R. aurora (180 items) CS Juvenile-Adult (i9l items) D Newly Metamorphosed R. ouroro (542 items) Q Newly Metamorphosed R. pretioso (116 items ). ^LJ-F 0) D T3 C 0) o o .^ n 3 0) O c 1. 3 E u H K FiRi Ehu < Food Item Figure 2. Comparison of dominant food items of frogs of different age classes, and percentage of total food intake each food item comprises. Top eight items are those most abundant in all stomachs of each age class (see text). Number in parentheses is total number of all food items found in stomachs of each group of both species. margins, and as the temperature rises they move into the water. R. pretiosa remain motionless for long periods, sometimes for an hour or more. Any suitable prey that moves near them evokes an orientation response, and if the prey is close, the frog strikes at it. Usually a prey is located on the water surface, and the frog swims towards it, kicking with the hind limbs and making little disturbance. Usually only the head and eyes of the frog protrude above the water. After stalking the prey in this manner, R. pretiosa strike from close range. On dry days, R. pretiosa are rarely found out of water. At most they are within m of the water. On dry days, I saw no feeding activity on land. However, during and after rain, these frogs move into the wet undergrowth and feed among the vegetation, some- times many m from the river. They quickly move into rainpools when these form in the field and feed from the water surface or margins. When rainpools dry, they return to the river. Newly transformed frogs of both species are often seen feeding within cm of each other, usually along the river edge or near rainpools. On hot summer days, when R. aurora are found along the river margins, the two species often feed in close proximity. However, on such occasions, R. pretiosa are
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