Fig. 4From: Host-parasite ecology, behavior and genetics: a review of the introduced fly parasite Philornis downsi and its Darwin’s finch hostsImages of Philornis downsi: a adult male (with yellow legs), b second instar larva (with smaller brownish posterior spiracles), c third instar larva (with larger black posterior spiracles), and d third instar larva consuming the blood and tissue of a Darwin’s finch nestling. Photos by Bradley Sinclair (a), Katharina Peters (b, c), and Jody O’Connor (d)Back to article page