two great crested grebe's on the water in courtship display

great crested grebe podiceps cristatus podicipedidae podicipediformes aves birds bird waterbird water aquatic adult male female carnivore hunter predator fisheater pair couple fauna least concern nature reserve lake pool fresh courtshipping courtship display surface afternoon april spring springtime europe nobody two animals rear view full length watching ornithology vogelplas starrevaart zuidholland leidschendam netherlands nederland grebe's grebe