{'fraction_non_alphanumeric': 0.014588859416445624, 'fraction_numerical': 0.0, 'mean_word_length': 5.239669421487603, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
First videotaped infanticide in the common pochard Aythya ferina

A growing body of literature suggests that infanticide is common in a variety of animals. However, most reports are concerned with infanticide by males and these evidences are often indirect or questionable. Here we describe the first videotaped non-parental infanticide by a female common pochard (Aythya ferina) which killed one conspecific duckling. Our observation does not suggest that this attack was caused by a high density of breeding pairs as was found for other ducks (resource competition hypothesis). We speculate that infanticide in this particular case might be adaptive because a reduced number of ducklings in the pond decreased the vulnerability to predation by raptors.