Riverton I male osprey on adjacent range marker from his nest.

Riverton I male osprey on adjacent range marker from his nest.

Seagull, squatting in the Andalusian ospreys' nest. In about two months, the raptors will be back to reclaim their home.

Seagull, squatting in the Andalusian ospreys' nest. In about two months, the raptors will be back to reclaim their home.

New range marker offshore from Pennypack Park on the Delaware River in Philadelphia. Thought maybe ospreys were going to make a nest on it, but it's only occupied by a lone cormorant.

New range marker offshore from Pennypack Park on the Delaware River in Philadelphia. Thought maybe ospreys were going to make a nest on it, but it's only occupied by a lone cormorant.

Cormorants on the functional Mud Island Shoal range marker, mid-February 2016.

Cormorants on the functional Mud Island Shoal range marker, mid-February 2016.

The ospreys across the Delaware River from Logan's Point are back as well. I'll have to take a trip over to the Jersey side to get a closer shot of the nesting pair.

The ospreys across the Delaware River from Logan's Point are back as well. I'll have to take a trip over to the Jersey side to get a closer shot of the nesting pair.

Riverton South Osprey; I really need to locate the street nearby on the Jersey side of the river to get a better photo of this pair.

Riverton South Osprey; I really need to locate the street nearby on the Jersey side of the river to get a better photo of this pair.

Riverton I pair; female is coming in for a landing. I should refer to these birds as Riverton North, which I'll start doing.

Riverton I pair; female is coming in for a landing. I should refer to these birds as Riverton North, which I'll start doing.

Pennypack Creek male in defensive pose while his mate roosts in the nest, evidently incubating.

Pennypack Creek male in defensive pose while his mate roosts in the nest, evidently incubating.

Pennypack Creek Ospreys

Pennypack Creek Ospreys

The Riverton, NJ, (across from Pennypack Park on the Delaware) birds are back. Note the female atop the range marker in the nest. Her mate is down below on the left rail, eating a fish. (2nd April)

The Riverton, NJ, (across from Pennypack Park on the Delaware) birds are back. Note the female atop the range marker in the nest. Her mate is down below on the left rail, eating a fish. (2nd April)

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