Fig. 2

Engorgement status of adult Ixodes ticks on the silicone membrane following 4 days of tick feeding. a Group of partially engorged I. scapularis females; example of males considered attached and semi-engorged are indicated with yellow arrows. b Semi-engorged females I. ricinus. c, d Outside view of the adult tick hypostomes perforating the silicone membrane, indicated with red arrows