Dromaeosauridae
Mahakala is both the most primitive dromaeosaur ever described and the smallest. This evidence, fits with Microraptor and the troodontid Anchiornis. It suggests the common ancestor of dromaeosaurs, troodontids, and birds – the 'ancestral paravian' – may have been small, around 65 cm in length and 600 to 700 grams mass.