Bullhead (Cottus gobio)
 Bullhead - overview Video credits © BBC Natural History Unit Audio credits © Master Tracks |  Male and female bullhead laying and fertilising eggs Video credits © Granada Wild Audio credits © Master Tracks |  Water beetle larva feeding on bullhead Video credits © BBC Natural History Unit Audio credits © Master Tracks |
 Male and female bullhead fighting Video credits © Granada Wild Audio credits © Master Tracks |
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