frog eggs from the common frog, rana temporaria, lying on moist grass on land. birkenes, norway

amphibian amphibious animal anura april aquatic biology birkenes breedig breeding brown clusters common creature eggs embryos european fauna fertilization forest frog frogspawn gelantinous grass jelly land life many mating nature norway rana reproduction seasonal slimy small spawn spawning species spring springtime survival tadpole temporaria unhatched wild wildlife young