Other Nest Occupants
Due to the large size of Osprey's nests and the height at which they nest, it is often found that other small birds will occupy parts of the nest. Since Osprey migrate for breeding, parts of the year their nests remain unoccupied by the larger birds, allowing time for smaller bird species to take up residence. The Osprey commonly reuse their nests and maintain its upkeep.
Monk parakeets are a non-native species that nests in groups. Monk parakeets often nest beneath osprey nests.
Osprey do not harm Monk Parakeets, but likely keep potential predators away from them. There is the possibility that Monk Parakeets could increase the number of parasites in osprey nests.
Monk Parakeet (Myiopsitta monachus)
House Sparrow (Passer domesticus)
House Sparrows and European Starlings (both non-natives) will also nest within Osprey nests, possibly increasing the number of parasites as well.
European Starling (Sturnus vulgaris)
Great Horned Owl ears appear above an Osprey nest.
Great Horned Owls do not share nests with Ospreys, they take them. These owls do not make their own nests, rather they steal nests from other species, primarily other raptors. They are capable of killing adult ospreys.
Great Horned Owl (Bubo virginianus)