Bufo bufo European Toad Bufonidae EUTO BUFBUF amphibians adult water pond lake forest grassland meadow spawn spawning swimming season toad migration floor street Brandenburg Germany March Spring nature environment piggyback piggy-back back male female pair carry walk walking wander sitting sit feed legs action two road roadside close up ground low-angle view grass skin duckweed traffic portrait bucket mating warts finger spring hatch hatching breed breeding incubate incubating pasture Europe Pellorneidae Fulvettas Ground Babblers copulation