MOTUS Peregrines On The Move

Downtown Pittsburgh juvenile peregrines. Bird on left has a MOTUS tag, 20 June 2019 (photo by Lori Maggio)

In June 2019 the Pennsylvania Game Commission fitted 10 of the state’s fledgling peregrines with MOTUS tracking devices to study where they go and how many survive their first year of life. Five months later the network has data locations for three (or maybe five) of them.

Keep in mind that only a few data points have been captured, the MOTUS data is still preliminary, and false positives sometimes occur. That said, here’s what we know so far.

Harrisburg female, Red, 46/BS (ID# 24660)

The path of the Harrisburg female peregrine (Red, 46/BS, ID#24660) looks quite promising. She flew first to Nockamixon (19 Sept), then west and south to Lamb’s Knoll (2 Oct) and Newtowne Neck near Compton, Maryland (4 Oct). The enhanced map below includes her banding location in Harrisburg. Click here for her path on the Motus website which does not include her banding location.

Map of Harrisburg Red peregrine, ID#24660, enhanced from MOTUS tracking map

Harrisburg male, White, 22/BZ (ID# 24662)

Initial data on the Harrisburg male (White, 22/BZ, ID#24662) were clouded by inaccuracies that placed him in both Reading, PA (Drasher) and Saskatchewan, Canada — 1,600 miles away — on the same day.

After removing the Saskachewan error there was still one more puzzle. The data table indicates that Harrisburg White flew 766 miles four times — from western Ontario (Harrington) to the Bay of Fundy (Gardner Creek) and back again. Would a bird have done this? And could he have made one of those trips in a single day, 24-25 August, in a head wind? Hmmm! Doubtful.

screenshot of Harrisburg White data table as of 25 Nov 2019

With those questions in mind I created the enhanced map below, adding his banding location and removing Gardner Creek (which may still be on his MOTUS map here). While his data is under review Harrisburg White is still on the move. He showed up near Aurora, Ontario on 16 November.

Map of Harrisburg White peregrine, ID#24662, enhanced from MOTUS tracking map

Nazareth, female, Red, 20/CA (ID# 24665)

Born at a quarry in Nazareth, Pennsylvania this female (Red, 20/CA, ID#24665) logged three data points on Amherst Island in Lake Ontario: 51 seconds on 17 and 19 July and three hours on 6 August. Without other locational data MOTUS cannot generate a map so I created one below with two points while her data is under review. Click here for her data table on the MOTUS website.

Proposed map of Nazareth Red peregrine, ID#24665, constructed by Kate St. John and enhanced MOTUS tracking data

Data uncertain: Pittsburgh, female, Blue, 19/CA (ID# 24664)

Interestingly there is a single 51-second data point for the Pittsburgh female (Blue, 19/CA, ID#24664) at Nazareth Red’s location on Amherst Island on 22 July. Its validity is uncertain. I marked it in orange on Nazareth’s map above.

Data uncertain: Bethlehem, male, Yellow, 60/AP (ID# 24666)

Bethlehem Yellow has a smattering of data points at the Allan Hills tower in Saskatchewan, but like the other Saskatchewan error this is 1,700 miles away from his banding site without any intervening locations. The data is under review.

As the MOTUS system gathers more information the picture for each bird will come into better focus. Meanwhile check out the tables and maps as they look today at the links below.

(photo of Pittsburgh juvenile peregrines by Lori Maggio, enhanced maps by Kate St. John from MOTUS tracking data; click on the captions to see the originals)