On the 1st April Yellow One Spot and Yellow Diagonal Bar were observed foraging and soaring over young forestry to the south of the Derryveagh Mountains. On one occasion, as both birds were soaring together, one eagle made an almost vertical stoop at a particular point among the young trees and the second eagle seemed to react a few seconds later and came gliding in at a much lower angle and both converged on the same spot. They failed to catch their prey (possibly a Hare), which I could not see, but it was clearly a tandem hunting attempt. It is thought that hunting in tandem is normally carried out by a pair of Golden Eagles but these two individuals had not yet formed a pair, though they have often been seen together periodically over the last two years. While observing the birds the radio signal from Diagonal Bar seemed to be somewhat intermittent suggesting a failing radio transmitter.
Diagonal Bar has not been recorded since but One Spot continued to wander throughout northern Donegal during April. Yellow Three Spots was noted in the Blue Stack Mountains on the 22nd and 24th but was later seen going to roost near the release cages in Glenveagh at 8.12 pm on 29th April. Another 2nd year eagle, Yellow Horizontal Bar was noted in the same two 10km squares in the Derryveagh Mountains during 9 different days throughout April. Meanwhile, Yellow Two Spots was also regularly noted in two 10km squares during the month.
Blue 1, 4 and 5 were noted near Slieve Sneacht on the 1st April. Blue 2 was near Lough Barra, Blue 8 was in the Glendowan Mountains and Blue 9 was seen as usual in Glenveagh National Park. The next day Blue 0 was noted in the Blue Stack Mountains but was back in Glenveagh by the 9th April. Since it was released, Blue 9 had stayed within the Park or nearby until the 12th April. On the 14th April it was seen in the Poisoned Glen pecking at the dried out hide of a dead sheep, which was already picked clean. Blue 9 may possibly be dependent on eating carrion.
On the 24th April 2 males (one first year and one second year bird) and one female were seen interacting over a mountain ridge. One of the males (presumably the older bird) started its undulating display flight and then started to chase the second male. The second year male, Yellow One Spot, had been almost 20km away two days previously. Nothing else of a territorial nature was noted in this area over the following weeks.